The spokeswoman for the United Kingdom's Labour Party slammed 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's behavior on Friday after he criticized British Prime Minister Theresa May's plan for leaving the European Union and attacked mass immigration as a source of terrorism in Europe.

Labour Party foreign affairs spokeswoman Emily Thornberry appeared on ITV's "Good Morning Britain" on Friday and slammed Trump's remarks to British newspaper The Sun as evidence of poor parenting, according to The Associated Press.

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"She is his host. What did his mother teach him? This is not the way you behave,” she said, adding that it was “extraordinarily rude of Donald Trump to behave like this.”

In a statement posted to Twitter, the Labour Party's leader, Jeremy Corbyn, added that Trump's policies were "dangerous and inhumane."

"Theresa May has invited President Trump to our country at a time when his dangerous and inhumane policies are putting the lives and wellbeing of millions of people at risk," Corbyn said of May, who leads the Conservative Party.

Theresa May has invited President Trump to our country at a time when his dangerous and inhumane policies are putting the lives and wellbeing of millions of people at risk. #TrumpUKVisit pic.twitter.com/69HdBTzkji — Jeremy Corbyn (@jeremycorbyn) July 13, 2018

Other Labour politicians criticized the president for the comments he made to The Sun on Thursday, especially his comments about immigration.

“The theory that if we are nice to Trump he’ll be nice to us doesn’t seem to be going brilliantly," former Labour leader Ed Miliband said, according to The Guardian.

“Trump is a racist and disrespects our nation. Why does he get to meet our Queen? And those Tories saying we should respect him simply because he is elected president — by that logic shouldn’t he respect our prime minister and London’s mayor?” added Anna Turley, a member of Parliament with the Labour Party.

Trump surprised many in British media with his attacks on May's Brexit plan during the Thursday interview, in which he chastised the struggling Conservative leader for not following his advice just days after she faced major resignations in her government.

“I would have done it much differently,” Trump said of May's Brexit plan. “I actually told Theresa May how to do it, but she didn’t listen to me.”

“She should negotiate the best way she knows how,” Trump continued. “But it is too bad what is going on.”

The White House later clarified Trump's remarks in a statement, noting that the president had called May a "very good person" in the same interview.

“As he said in his interview with the Sun she ‘is a very good person’ and he ‘never said anything bad about her,’” press secretary Sarah Huckabee Sanders said in a statement to The Hill. “He thought she was great on NATO today and is a really terrific person."

“He is thankful for the wonderful welcome from the Prime Minister here in the U.K.”