Only a quarter of voters in a new poll think President Trump's claim that millions of illegal votes were cast in the presidential election are true.

According to the Politico/Morning Consult poll, 25 percent of registered voters agree with the president that millions of people voted illegally in the 2016 race. Another 44 percent don't believe millions of votes were cast illegally, and 31 percent said they didn't know or had no opinion.

Thirty-five percent of respondents said, though, that if voter fraud did occur in the election, Trump was likely the candidate that benefited from the improper votes. Another 30 percent say Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonBiden courts veterans amid fallout from Trump military controversies Biden looks to shore up Latino support in Florida MLB owner: It's 'very necessary' to vote for Trump MORE would have benefited.

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Trump claimed last month that 3 million to 5 million illegal votes were cast in the 2016 presidential election, costing him the popular vote.

He later tweeted that he would ask for a "major investigation" into voter fraud, although there is no evidence to back up the president's claim.

The Politico/Morning Consult poll also finds that 49 percent of voters approve of how Trump is doing his job, while 41 percent disapprove.

When asked about the wall Trump plans to build along the U.S.-Mexico border, 42 percent said it should not be built when told the cost would be between $8 billion and $14 billion. Sixteen percent said the wall should only be built if Mexico pays for it, and 29 percent say the wall should be built even if the U.S. has to pay.

The poll was conducted from Jan. 26 to 28 among 1,991 voters. The margin of error is 2 percentage points.