Outgoing British 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 on Monday described 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's remarks telling a group of Democratic congresswomen to go back to the countries they came from "completely unacceptable," according to a report from the BBC.

May, who has been insulted herself by the U.S. president, made the comment about Trump through a spokesperson. The prime minister is set to step down in the coming weeks.

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Just last week, Trump criticized May as "foolish" for her failure to secure a deal to take the United Kingdom out of the European Union.

The insults came after a series of leaked cables showed former British Ambassador to the U.S. Kim Darroch had belittled Trump. The president also insulted him repeatedly over Twitter as a "fool," very stupid" and "wacky."

May has previously criticized Trump for comments made in the wake of the deadly violence at a 2017 white supremacist demonstration in Charlottesville, Va., but Monday's comments are the most direct indictment of the president.

Trump's remarks about the Democratic congresswomen seemed to target Reps. Ilhan Omar Ilhan OmarOmar fires back at Trump over rally remarks: 'This is my country' Trump attacks Omar for criticizing US: 'How did you do where you came from?' Democrats scramble on COVID-19 relief amid division, Trump surprise MORE (D-Minn.), Rashida Tlaib Rashida Harbi TlaibTrump attacks Omar for criticizing US: 'How did you do where you came from?' George Conway: 'Trump is like a practical joke that got out of hand' Pelosi endorses Kennedy in Massachusetts Senate primary challenge MORE (D-Mich.), Alexandria Ocasio-Cortez Alexandria Ocasio-CortezOn The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline McCarthy says there will be a peaceful transition if Biden wins Anxious Democrats amp up pressure for vote on COVID-19 aid MORE (D-N.Y.) and Ayanna Pressley Ayanna PressleyFauci, Black Lives Matter founders included on Time's 100 Most Influential People list Trump attacks Omar for criticizing US: 'How did you do where you came from?' Pressley applauded on House floor after moving speech on living with alopecia MORE (D-Mass.).

Only Omar was born outside the U.S. Tlaib, Ocasio-Cortez and Pressley were all born in the U.S.

Trump's quotes have widely been called racist. The New York Times in a story on Monday wrote that Trump "saw the dry kindling of race relations and decided to throw a match on it."