The May 17-19 national poll found that 53% of Republicans believe Trump, their party's nominee, is the “true president” now, compared to 3% of Democrats and 25% of all Americans.
About one-quarter of adults believe the Nov. 3 election was tainted by illegal voting, including 56% of Republicans, according to the poll. The figures were roughly the same in a poll that ran from Nov. 13-17 which found that 28% of all Americans and 59% 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 61% of Republicans believe the election was "stolen" from Trump. Only about 29% of Republicans believe he should share some of the blame for his supporters' Jan. 6 deadly riot at the US Capitol.
Still, 67% of overall respondents say they trust election officials in their town to do their job honestly, including 58% 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.