WASHINGTON - The US House of Representatives voted on Tuesday to condemn President Donald Trump for "racist comments" against four minority Democratic congresswomen, a symbolic measure aimed at shaming Trump and his fellow Republicans who stood by him.

The 240-187 vote, which split mainly along party lines, was the culmination of three days of outrage sparked by a Trump tweetstorm that diverted attention from other business in Washington but had little impact on the president's overall approval rating, according to a new Reuters/Ipsos poll. Trump is seeking re-election next year.

Trump had told the group of congresswomen on Sunday to "go back and help fix the totally broken and crime infested places from which they came".

All four lawmakers - Alexandria Ocasio-Cortez of New York, Ilhan Omar of Minnesota, Ayanna Pressley of Massachusetts and Rashida Tlaib of Michigan - are US citizens. Three were born in the United States.

Democrats, who have a majority in the House, passed the resolution on Tuesday evening, which said the House "strongly condemns President Donald Trump's racist comments that have legitimized and increased fear and hatred of new Americans and people of color".

Four Republicans and one independent joined the Democrats to support the measure.

The White House did not immediately comment.

Trump's attacks on the four progressive congresswomen - known as "the squad" - have been viewed as an effort to divide Democrats, who won control of the House in 2018 and have the power to thwart his legislative agenda.

House Speaker Nancy Pelosi, who has struggled at times to work with the progressive newcomers in her caucus, staunchly defended them in the debate. After the vote, Omar held a long, animated conversation with Pelosi on the House floor and put her arm around the speaker, the top elected US Democrat.

"These comments from the White House are disgraceful and disgusting and these comments are racist," Pelosi said. "Every single member of this institution, Democratic and Republican, should join us in condemning the president's racist tweets."

Pelosi's comments put the House into a two-hour limbo after Republicans argued she went too far in her comments and broke debate rules.

House Republican leader Kevin McCarthy criticized Democrats for remarks that upset the "order and decency" of the chamber, saying: "Today is the day that historians will write about."

Some Republicans defended Trump's tweets, like Tom McClintock of California, who said the president was commenting on the patriotism of the congresswomen, not their race.

"I wish the president were more temperate in the words he sometimes uses and I agree that the tone of his recent remarks was unnecessarily provocative. But his central point is irrefutable," McClintock said.

Republican Representative Doug Collins of Georgia said lawmakers should be pursuing reconciliation rather than escalating attacks against Trump, condemning the "breathtaking partisanship of today's exercise."

Republican Senate Majority Leader Mitch McConnell told reporters that he thought "everybody ought to tone down their rhetoric".

"The president is not a racist and I think the tone of all of this is not good for the country, but it's coming from all different ideological points of view," McConnell said.