President Donald Trump's warnings against voter fraud stuck a chord with many Republicans, half of whom would support suspending the 2020 election until this problem is fixed.

The Washington Post surveyed over 1,000 American adults, focusing on the 650 voters who identify as or lean Republican, who were asked both about the previous presidential election and the next.

Forty-seven percent believe Trump won the popular vote.

Sixty-eight percent believe millions of illegal immigrants voted.

Seventy-three percent believe voter fraud happens somewhat or very often.

Fifty-two percent would support postponing the election.

Fifty-six percent support postponing the election if Trump and congressional Republicans called for it.

"Not surprisingly, beliefs about the 2016 election and voter fraud were correlated with support for postponement," wrote Ariel Malka of Yeshiva University and Yphtach Lelkes of the University of Pennsylvania for the Post.

"People who believed that Trump won the popular vote, that there were millions of illegal votes in 2016, or that voter fraud is not rare were more likely to support postponing the election. This support was also more prevalent among Republicans who were younger, were less educated, had less factual knowledge of politics and strongly identified with the party."