President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE engaged in a tense conversation with British Prime Minister Theresa May, berating her over the phone while flying to Paris last Friday, according to the Washington Post.

May was reportedly calling Trump to congratulate him about Republicans' performance in the midterm elections, when the president apparently ripped into her.

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According to the Post, Trump criticized May for not doing enough to rein in Iran, questioned her over Brexit and complained about European-American trade relationships.

According to U.S. and European officials briefed on the conversation, May and her aides were particularly shaken by this call, despite having endured criticism from Trump before.

May has consistently argued that Iran is meeting its obligations under the nuclear deal, despite Trump exiting the agreement and reimposing sanctions.

May and her cabinet are set to meet Wednesday to discuss the details of the U.K.'s exit from the European Union.

The White House did not immediately respond to The Hill's request for comment on the reported phone call.