President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE on Tuesday congratulated Boris Johnson after it was announced Johnson would become the country's next prime minister.

"Congratulations to Boris Johnson on becoming the new Prime Minister of the United Kingdom," tweeted Trump. "He will be great!"

Congratulations to Boris Johnson on becoming the new Prime Minister of the United Kingdom. He will be great! — Donald J. Trump (@realDonaldTrump) July 23, 2019

Johnson won a Conservative Party leadership contest, garnering 92,153 votes compared to rival Jeremy Hunt's 46,656.

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The politicians have had a positive relationship in the past, with Trump saying prior to Johnson's election that he would be an “excellent” prime minister.

“I like him. I have always liked him. I don’t know that he is going to be chosen, but I think he is a very good guy, a very talented person,” Trump told The Sun of Johnson in an interview during his U.K. visit this year.

Outgoing Prime Minister Theresa May Theresa Mary MayAre US-Japan relations on the rocks? Trump insulted UK's May, called Germany's Merkel 'stupid' in calls: report Bolton says Boris Johnson is 'playing Trump like a fiddle' MORE, whose resignation triggered the leadership contest, also voiced support for Johnson despite having often being the target of his criticism.

Many congratulations to @BorisJohnson on being elected leader of @Conservatives - we now need to work together to deliver a Brexit that works for the whole UK and to keep Jeremy Corbyn out of government. You will have my full support from the back benches. — Theresa May (@theresa_may) July 23, 2019

Johnson after being elected pledged "to get Brexit done." He will become prime minister Wednesday.