President Donald Trump's approval rating with Republicans rose in a poll taken after his racist tweets on Sunday attacking four Democratic congresswomen of color.

Trump's net approval with Republicans in the new poll, conducted online Monday and Tuesday by Reuters/Ipsos, rose 5 percentage points, to 72%, from a similar poll conducted last week.

Trump has fiercely defended the tweets, which were aimed at Reps. Alexandria Ocasio-Cortez of New York, Rashida Tlaib of Michigan, Ilhan Omar of Minnesota, and Ayanna Pressley of Massachusetts.

Trump, who is running for reelection in 2020, also saw his approval drop with Democrats and independents in the new poll. All the changes in support were within the poll's credibility interval, an attempt at measuring precision.

When President Donald Trump was asked by a reporter on Monday whether he was concerned that his tweets attacking four Democratic lawmakers were widely viewed as racist, the president said no because "many people agree with me."

It appears he may have been correct.

A national survey conducted online by Reuters/Ipsos on Monday and Tuesday — following Trump's racist tweets on Sunday — found that his approval rating went up with Republicans.

His net approval with Republicans in the new poll was 72%, an increase of 5 percentage points from a similar poll conducted last week.

On the other hand, Trump's approval dropped with Democrats and independents after his tweets. The poll found that about 30% of independents supported Trump, dropping from roughly 40% last week. Trump's net approval with Democrats dropped by 2 points in the new poll.

The latest online poll surveyed 1,113 adults. The credibility interval, an attempt at measuring precision, was 5 points for both Republicans and Democrats, meaning Trump's approval among Republicans, for example, could in fact be unchanged or even greater than the 5-point change found in the poll.

Trump's approval rating overall was unchanged since last week, with 41% of the US public approving of his performance in office and 55% disapproving.

Read more: Republican silence on Trump's racist tweets shows how fearful they've become of defying him and losing voters

Trump in his tweets told the lawmakers, who are women of color and US citizens, that they should "go back and help fix the totally broken and crime infested places from which they came." The tweets played off of the racist "go back to Africa" trope.

The president's demeaning tweets have prompted outrage across the US and led to condemnation from world leaders. A resolution condemning Trump's tweets passed in the House on Tuesday with every Democratic member voting in favor of it. Democrats were joined by just four Republican lawmakers in passing the resolution.

The GOP has remained overwhelmingly silent on the subject of Trump's tweets, and Republican leaders have rejected the notion they were racist.

Trump has fiercely defended the tweets, which were aimed at Reps. Alexandria Ocasio-Cortez of New York, Rashida Tlaib of Michigan, Ilhan Omar of Minnesota, and Ayanna Pressley of Massachusetts. The president on Tuesday said the tweets weren't racist and that he didn't have a "racist bone" in his body.

A separate USA Today/Ipsos poll conducted online Monday and Tuesday found that 58% of Americans felt Trump's tweets were "un-American."