Alexandria Ocasio-Cortez, Ilhan Omar (C) and Haley Stevens arrive for a photo opportunity with the female House Democratic members. File / AFP
"Her view is that the language which was used to refer to the women was completely unacceptable," May's spokesman told reporters.
Trump and May have endured a rocky relationship, which took a turn for the worse last week following the leak of diplomatic British cables highly critical of his presidency.
Ilhan Omar (L) and Rashida Tlaib arrive for the State of the Union address at the US Capitol in Washington. File / AFP
Angered by May's support for her ambassador, Trump assailed the prime minister over her handling of fraught Brexit negotiations, and welcomed her impending departure from office.
"What a mess she and her representatives have created," Trump fumed in a series of tweets. "I told her how it should be done, but she decided to go another way."
"The good news for the wonderful United Kingdom is that they will soon have a new Prime Minister," he wrote.
Boris Johnson is the heavy favourite to replace May as prime minister, and has spoken out in support of the US president, with both men enthusiastic backers of Brexit.
Johnson wants to visit Trump immediately he becomes prime minister to try to negotiate a post-Brexit trade deal, according to the Times on Monday.
But May's comments will now raise the pressure on him to condemn the president's comments.
Trump accused congresswomen who "originally came from countries whose governments are a complete and total catastrophe" of "viciously telling the people of the United States, the greatest and most powerful Nation on earth, how our government is to be run."
"Why don't they go back and help fix the totally broken and crime infested places from which they came. Then come back and show us how it is done," Trump wrote.
Protesters waved witty and sometimes rude placards at a what organizers called a "Carnival of Resistance" in Trafalgar Square while Prime Minister Theresa May was in talks with the president a short distance away in Downing Street.
Trump told the Sunday Times in an interview that Britain should "walk away" from talks and refuse to pay a £39 billion ($49 billion) divorce bill if it doesn't get better terms from the EU.
He will hold a meeting with British Prime Minister Theresa May in Downing Street and the trip also coincides with events to mark the 75th anniversary of the D-Day landings during World War Two.
The charismatic frontman of Thailand’s anti-military parliamentary bloc appeared in court on Friday accused of breaching election rules by holding media shares, a case which could see him barred from
Hong Kong’s Cathay Pacific Airways Ltd on Friday lowered its expectations for full-year profit as a result of “incredibly challenging” conditions in its home market that were expected to persist for the rest of 2019.
US President Donald Trump said on Thursday that he allowed Turkish and Kurdish forces to clash in deadly battle because the two sides were like children who needed to fight each other.