(Reuters)

President Trump effectively declared war Thursday on the House Freedom Caucus, the powerful group of hard-line conservative Republicans who blocked the health-care bill, vowing to “fight them” in the 2018 midterm elections.

In a morning tweet, Trump warned that the Freedom Caucus would “hurt the entire Republican agenda if they don’t get on the team, & fast.” He grouped its members, all of them Republican, with Democrats in calling for their political defeat — an extraordinary incitement of intraparty combat from a sitting president.

There are about three dozen members of the Freedom Caucus, and most of them were elected or reelected comfortably in solidly Republican districts. With his tweet, Trump seemed to be encouraging primary challenges to each of them in next year’s elections. Asked to elaborate on Trump’s threat, the White House had no immediate comment.

“Nothing to add at this time,” White House spokeswoman Sarah Huckabee Sanders said. “The president’s tweet speaks for itself.”

House Speaker Paul D. Ryan (R-Wis.) told reporters late Thursday morning that he sympathized with Trump.

“I understand the president’s frustration,” said Ryan, who has unable to push the health-care bill through his own chamber. “I share frustration. About 90 percent of our conference is for this bill to repeal and replace Obamacare and about 10 percent are not. And that’s not enough to pass a bill.”

Ryan said he had no immediate plans to bring the health-care bill back to the House floor.

“This is too big of an issue to not get right, and so I’m not going to put some kind of artificial deadline on saving the American health-care system from oncoming collapse,” said Ryan, who initially scheduled the bill’s passage for the seventh anniversary of the Affordable Care Act’s signing. “I just think it’s too important.”

Trump and his White House advisers have been frustrated by the intransigence of Freedom Caucus members, led by Rep. Mark Meadows (R-N.C.). Trump lobbied them intensively to support the GOP plan to replace President Barack Obama’s signature Affordable Care Act, only to see the bill collapse last Friday after Meadows and some of his allies said they would not vote for it.

(The Washington Post)

“This has been brewing for a while,” a White House official said of Trump’s decision to target Freedom Caucus members and other GOP foes.

Trump has been “paying close attention and keeping his options open,” said the official, who was not authorized to speak publicly and requested anonymity to do so. “Our view is: There’s nothing as clarifying as the smell of Air Force One jet fuel. So if he needs to bring in the plane and do a rally, he’s going to think about doing that.”

The official added that Trump and White House aides are “sick and tired” of seeing Freedom Caucus members on television in recent days.

Trump’s threat comes as Republican leaders are bracing for a month of potential GOP infighting over spending priorities. Congress must pass a spending bill by April 28 to avert a government shutdown, but the path ahead, as in recent spending battles on Capitol Hill, is narrow and filled with obstacles.

Beyond that, the same divide that derailed the health-care legislation could imperil the next marquee legislation Trump wants to tackle: tax reform.

Most Freedom Caucus members were elected from very safe Republican districts, and many of them faced no primary opposition in their last election. To make good on his threat, Trump would have to recruit GOP candidates to make the case that the Republican incumbent they face was unhelpful to the president.

Though Trump’s job approval numbers are sagging, he remains quite popular in many of the districts from which the Freedom Caucus members were elected.

On Capitol Hill, Trump’s tweet was met with a range of reactions — with some members saying it could prove counterproductive and others praising him for using the power of his office in a way he hasn’t to this point.

Rep. Mark Sanford (R-SC), a former governor who has called for the health reform to work its way through Congress more slowly, said that the president was taking exactly the wrong approach to his fellow House Freedom Caucus members.

“The idea of threatening your way to legislative success may not be the wisest of strategies,” Sanford said. “His message yesterday was that he wanted to work with Democrats; I guess the message today is ‘we need to fight against Freedom Caucus members and Democrats.’ That’s a conflicted message. It’s a case of shooting messengers who were, rightfully, pointing out problems in a bill that the American public has not shown a proclivity toward.”

Rep. Jim Jordan (R-Ohio), a Freedom Caucus member, said the break with Trump on the health-care legislation was based on real policy differences, not a lack of loyalty.

“The president can say what he wants and that’s fine. But we’re focused on the legislation,” Jordan told reporters.

During an appearance on CNN, Rep. Dave Brat (R-Va.), another Freedom Caucus member, noted that polling showed public approval for the health-care bill embraced by Trump at just 17 percent.

“We are all getting to ‘yes’ for President Trump on this bill, but we have to make it better,” Brat said.

“We all ran on exactly the themes the president ran on,” Brat added. “We’re with him, but somebody’s gotten into his ear.”

Some of the harshest responses to Trump came via Twitter, his preferred means of provocative communication. Those included a tweet from Rep. Justin Amash (R-Mich), who said that Trump’s support of the health-care bill signaled he was now part of the Washington establishment that he had campaigned against.

“It didn’t take long for the swamp to drain @realDonaldTrump,” said Amash, a member of the Freedom Caucus and one of Trump’s frequent GOP critics. “No shame, Mr. President. Almost everyone succumbs to the D.C. Establishment.”

Rep. Kevin Cramer (R-N.D.), who’s not part of the Freedom Caucus, said he was among the members sympathetic to Trump, however.

“There’s a fair number of us who are applauding him,” said Cramer, adding that he saw the tweet as being true to Trump’s blustery, aggressive nature. But Cramer, an early Trump supporter, also acknowledged some members would only be emboldened by the tweet.

“The political reality for them is different for them than the political reality for someone like me,” Cramer said. “So that’s a little bit of a dilemma. But at the end of the day, if Obamacare is the law of the land two years from now, what do they have to brag about to their constituents?”

Rep. Thomas Massie (R-Ky.), a hard-liner who is an ally but not a member of the Freedom Caucus said: “This is the president being the president. We still like him.”

But he said the tweet was counterproductive: “When you’ve got 435 members, the way I do the math, and you subtract all the Democrats, and you subtract all the conservatives, you can’t get to 218, so somebody needs to work on the math there.”

“We’re on his side,” Massie added. “We just feel he’s been misled on ‘SwampCare.’ ”

On the other hand, Rep. Chris Collins (R-N.Y.) said Trump’s focus on the Freedom Caucus is well-placed.

“He’s obviously frustrated, as many of us are, and there’s only one place where the finger-pointing should go, and that’s to the Freedom Caucus,” he said.

And Collins, a member of the moderate Tuesday Group, rejected any notion — put forth this week by members of both groups — that there could be an accommodation on the health-care bill forged between them.

“The Tuesday Group will never meet with the Freedom Caucus, with a capital N-E-V-E-R,” Collins said.

The only way the health-care bill could be rekindled, he added, would be if Freedom Caucus members became willing to accept a bill that was substantially the same as the one that failed Friday.

“Frankly, I don’t see that happening,” he said.

Sen. Rand Paul (R-Ky.), an ally of the House Freedom Caucus, said that “lines of communication are still open” between caucus members and the White House. Asked to respond to Trump’s threat, Paul said he thought the White House could reach a compromise and stopped short of criticizing Trump’s tactics.

“I can only control my own words and my point of view is I think we still have a chance for compromise,” Paul said.

Asked about Trump’s tweet targeting the Freedom Caucus, Sen. John McCain (R-Ariz.) said on Thursday: “I really do think they need to get on board, but I’m not sure that that’s the proper approach to them because they are elected by their constituents.”

Trump and his aides have spoken publicly in recent days about reaching out to conservative Democrats to help move the administration’s agenda if Freedom Caucus members remain a hindrance in the House.

But given the poisoned atmosphere on Capitol Hill, many analysts have suggested Trump is likely to make limited headway there and would benefit more from bringing Freedom Caucus members in line.

Michael Steel, who was a senior aide to then-Speaker John A. Boehner (R-Ohio), said there is potential in some districts for Trump to dislodge Freedom Caucus members if he puts his political organization behind the effort.

“If the president chooses to support primary challengers to House members who’ve been unhelpful, it wouldn’t necessarily be an ideological challenge,” Steel said. “It would be based on loyalty to the president, or lack thereof.”

But Steel added: “You don’t necessarily have to wait for 2018 for this to have an effect. Even the threat could work in the short term.”

Republicans, meanwhile, were at odds Thursday about the wisdom of working with Democrats on health care.

In a television interview that aired Thursday morning, Ryan said that he does not want Trump to work with Democrats on new legislation for revamping the Affordable Care Act.

“I don’t want that to happen,” Ryan said on “CBS This Morning.”

Those comments were criticized by Sen. Bob Corker (R-Tenn.) , who said: “It’s not the kind of thing that the leader, the speaker of a House, should be saying.”

Corker said that he has a “lot of respect” for both Ryan and members of the House Freedom Caucus. But he said he sees “zero overlap” in health-care policy plans between Trump and the Freedom Caucus.

“I see an impossibility of President Trump putting forth a piece of legislation on health care that he supports and the Freedom Caucus supports,” Corker said. “Unless -- unless one of the two is willing to give up their principles.”

Earlier Thursday morning, Corker tweeted: “We have come a long way in our country when the speaker of one party urges a president NOT to work with the other party to solve a problem.”

Rep. Leonard Lance (R-N.J.), a member of the moderate Tuesday Group, also said that it was wrong to rule out working with Democrats.

“I hope that the Democrats will come to the changes, because the exchanges are in significant difficulty,” he said, speaking of a major facet of the Affordable Care Act.

Grover Norquist, the well-known anti-tax activist, initially cheered Trump’s election, saying all Republicans needed to achieve their goals was a president who would sign off on Trump’s bill.

After meeting Thursday with Ryan and conservatives who had backed the health-care bill, Norquist said he still thinks that is the case.

“Trump will cheerfully sign the Obamacare repeal bill, the best one that he can get passed,” Norquist said. “The problem isn’t with Trump’s penmanship. The challenge is now reminding people that if you don’t have 218, you don’t get anything.”

Robert Costa, David Weigel, Sean Sullivan and Scott Clement contributed to this report.