If you're curious whether Donald Trump Jr. has learned anything from his president father, the answer became clear Wednesday about two hours after a suspected terror attack in London killed four people and injured up to 40 other people, many of them critically.

The answer: A resounding yes. Yes, he has learned a lot from his dad. At least when it comes to slapping out ill-informed, ill-advised, ill-conceived and facts-be-damned tweets.

Like his father, the younger Trump is not known to have ever apologized for anything. He is not likely to admit that a tweet he sent Wednesday was insensitive, unseemly and grossly misleading, never mind that he later deleted it as he was being buried in a flurry of angry Twitter responses from Britons. And never mind his "no comment" to reporters who wanted to know what he was thinking when he sent the tweet.

"You have to be kidding me?!" President Trump's oldest son tweeted Wednesday afternoon. "Terror attacks are part of living in big city, says London Mayor Sadiq Khan."

At least three problems with that tweet:

1) The timing. Donald Junior decided it would be a good idea to bash Khan just two hours or so after his city was hit by a suspected terror attack that killed three pedestrians and a police officer and left another 40 people injured.

2) The accuracy. Apparently it did not occur to Trump that a more appropriate tweet would have conveyed support and/or sympathy. Instead, Junior decided to send a tweet that included a quote from the mayor that was taken wildly out of context, implying that Khan was shrugging off the attack by conceding terror attacks are just "an inescapable part of living in a big city." In fact, the mayor's words were in response to a September bombing in the Chelsea neighborhood of New York City. And far from throwing up his hands over terrorism, as the quote implies, in real life it was part of a message urging Londoners to remain vigilant. Terrorism preparedness, the mayor said in real life, was “part and parcel of living in a great global city.”

3) The Brits. They are our friends. Have been for a long time. Wasn't accusing their spy agencies of snooping on the president enough damage for one month?

London is a bustling, sophisticated, world-class city, much like Trump Junior's childhood home of New York City, only cleaner, better behaved and much, much safer.

Its multicultural character is reflected in the home countries of those injured Wednesday. They included 12 Britons, at least four South Koreans, three French schoolchildren, two Romanians and one citizen each of China, Germany, Greece, Ireland and Italy.

While Londoners are mostly welcoming, though, they do not take kindly to slights.

Wes Streeting, a member of Parliament from the Labour Party, responded to Trump Junior by accusing him of trying to capitalize on the attacks. He called the president's son a "disgrace."

Others were less polite.

Off Twitter and in the real wold of London, Parliament met Thursday morning as scheduled, and the city carried on.

“Yesterday, an act of terrorism tried to silence our democracy,” Prime Minister Theresa May said as she stood in the chamber. “We are not afraid, and our resolve will never waver in the face of terrorism.”

As for Mayor Khan?

He may have a lesson to offer: He would not respond to Trump Junior, he told reporters in London, because he has more important things to do.

"We stand together in the face of those who seek to harm us and destroy our way of life," the mayor said, inviting Londoners to gather Thursday night in Trafalgar Square to show solidarity as a city and respect for those killed.

"We will never," the mayor said, "be cowed by terrorism."

Photo: Jeff Vinnick/Getty Images News

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