Sixty-eight percent of registered voters queried in a recent poll say they don't think Democrats have accepted Donald Trump as a legitimate president or that he won the election fairly, The Hill reports.

The poll, conducted by the Harvard Center for American Political Studies and the Harris poll from May 17-20, comes a day after Trump retained a private attorney to help him navigate the investigations into his campaign and suspected Russian interference in the 2016 election.

Trump's job approval rating fell to 55 percent in the poll, a new low, and only 16 percent of Democrats approved of the job the president was doing.

The Trump administration has come under tremendous scrutiny in the past two weeks following the firing of FBI Director James Comey and allegations that Trump asked Comey to stop an investigation into former national security adviser Mike Flynn after he resigned.

Democratic lawmakers have publicly called for Trump's impeachment and have accused Trump of attempting to block investigations into the Russia probe.

The Harvard-Harris online poll surveyed 2,006 registered voters. Thirty-six percent were Democrat, 32 percent were Republican and 29 percent were independent or other. The poll uses a methodology that doesn't produce a traditional margin of error.