Donald Trump Lashes Out at 'Stupid Guy' U.K. Ambassador Who Called Him 'Insecure' in Leaked Emails

President Donald Trump has launched a fresh attack on the U.K.'s ambassador to the U.S., whose internal emails were leaked this weekend to the embarrassment of the administrations in both Washington and London.

Sir Kim Darroch has come under fire after some of his communications with London were leaked, detailing his concern over the state of Trump's administration. Darroch, who had been due to step down at the end of this year, branded the Trump White House "insecure," "clumsy" and "inept," among other things.

The president does not deal well with personal attacks, and—somewhat proving the ambassador's point—responded to the leak by declaring he would no longer work with Darroch, who he described as "not liked or well thought of" in Washington.

Trump even broadened his attack to include British Prime Minister Theresa May, who will leave office this month. "The good news for the wonderful United Kingdom is that they will soon have a new Prime Minister," he tweeted.

The British government is standing behind Darroch, arguing that diplomats must be able to be frank and open about their perceptions of the countries in which they work. However, an investigation is underway to locate the source of the leak, which has caused great embarrassment for the British government.

Meanwhile, Trump is continuing his attacks. "The wacky Ambassador that the U.K. foisted upon the United States is not someone we are thrilled with, a very stupid guy," he tweeted on Tuesday. "He should speak to his country, and Prime Minister May, about their failed Brexit negotiation, and not be upset with my criticism of how badly it was handled."

Again, Trump decided to broaden his offensive to include May. "I told @theresa_may how to do that deal, but she went her own foolish way-was unable to get it done. A disaster!" he said.

Trump's had opined on Brexit several times, though none of his suggestions have been realistic. When visiting the U.K. in 2018, Trump suggested May should sue the European Union before even entering negotiations.

Former presidential adviser Steven Bannon told Sky News that Trump also suggested May should "overshoot the target on your deal because it will come apart," "get on with it—you ought to be on terms agreed within six months," and to "use every arrow in your quiver even if you have to do litigation later."

Turning back to Darroch, the president said: " I don't know the Ambassador but have been told he is a pompous fool. Tell him the USA now has the best Economy & Military anywhere in the World, by far and they are both only getting bigger, better and stronger.....Thank you, Mr. President!"

What to do with Darroch will be a tricky challenge for the next prime minister, who will assume office before the end of this month. The current front runner is former Foreign Secretary Boris Johnson, himself no danger to high-profile diplomatic gaffes.

Trump has praised Johnson on multiple occasions, even though the former London mayor once lamented the president's "stupefying ignorance that makes him, frankly, unfit to hold the office of president of the United States."

Though Johnson would be keen to build close ties with Washington amid a looming Brexit catastrophe, any concessions will be seen as a humiliating concession to the pugnacious president.