A majority of Republicans still believe Donald Trump won the 2020 US presidential election and blame his loss to Joe Biden on illegal voting, according to a new Reuters/Ipsos opinion poll.

The May 17-19 national poll found that 53pc of Republicans believe Trump, their party's nominee, is the “true president” now, compared to 3pc of Democrats and 25pc of all Americans.

About one-quarter of adults believe the November 3 election was tainted by illegal voting, including 56pc of Republicans, according to the poll.

The figures were roughly the same in a poll that ran from November 13-17 which found that 28pc of all Americans and 59pc of Republicans felt that way.

A Democrat, Biden won by more than seven million votes. Dozens of courts rejected Trump's challenges to the results, but Trump and his supporters have persisted in pushing baseless conspiracy theories on conservative news outlets.

The Reuters/Ipsos poll showed that 61pc of Republicans believe the election was "stolen" from Trump. Only about 29pc of Republicans believe he should share some of the blame for his supporters' January 6 deadly riot at the US Capitol.

Still, 67pc of overall respondents say they trust election officials in their town to do their job honestly, including 58pc of Republicans, according to the poll.

The November and May polls were both conducted online, in English, throughout the United States.

The May poll gathered responses from 2,007 adults, including 909 Democrats and 754 Republicans.

The poll has a credibility interval, a measure of precision, of about 4 percentage points.