President Trump (EPA/SHAWN THEW)

Here is a brief list of people who have said that President Trump's allegation that President Obama ordered a wire tap at Trump Tower during the 2016 election is simply not true:

1. Devin Nunes

The Republican chairman of the House Intelligence Committee, who has been one of the few defenders of Trump's claims, made clear on Tuesday that there is zero evidence to suggest Trump Tower was wire-tapped.

"I don't think there was an actual tap of Trump Tower," Nunes said.  He added that if you are taking Trump's tweets literally -- which he said you shouldn't do -- then "clearly the president was wrong."

2.  James Clapper

The former Director of National Intelligence made clear in an interview with NBC's Chuck Todd that no such wire tapping happened. "There was no such wiretap activity mounted against the president, the president-elect at the time, or as a candidate, or against his campaign," said Clapper. He also offered a total and unequivocal denial that a FISA (Foreign Intelligence Surveillance Court Act) warrant had been issued to create such a wire-tap.

3. President Obama

In a statement issued via a spokesman shortly after Trump tweeted the wire-tapping allegations, Obama said this:  "A cardinal rule of the Obama administration was that no White House official ever interfered with any independent investigation led by the Department of Justice. As part of that practice, neither President Obama nor any White House official ever ordered surveillance on any US citizen. Any suggestion otherwise is simply false."

4. James Comey

The FBI director, who is set to testify on Capitol Hill on the matter on March 20, was so outraged by Trump's allegation that he pushed, unsuccessfully, to have the Justice Department publicly refute it. Wrote the New York Times:

Mr. Comey’s request is a remarkable rebuke of a sitting president, putting the nation’s top law enforcement official in the position of questioning Mr. Trump’s truthfulness. The confrontation between the two is the most serious consequence of Mr. Trump’s weekend Twitter outburst, and it underscores the dangers of what the president and his aides have unleashed by accusing the former president of a conspiracy to undermine Mr. Trump’s young administration.

Against such strong denials from people in position to know, the White House has offered up, well, not much. Trump has largely gone silent since making the allegations 10-ish days ago. His White House senior aides have been backpedaling; the latest being press secretary Sean Spicer's decidedly-odd argument that "wire tapping" and wire tapping are simply not the same thing. (Breaking news: They are!)

As I wrote at the time that Trump leveled these very serious allegations: The burden of proof was on him. To suggest a former president orchestrated a listening program using the tools and resources of the federal government during a heated national campaign is a big charge. To do so without providing evidence -- then or now -- is eye-popping.

The repercussions for such charges should be serious. After all, this is conspiracy theorizing at the top levels of government. But, they almost certainly won't be as a Republican Congress is unlikely to scold a Republican president so new to the White House. And Trump, if past is prologue, will somehow declare victory and move on.