The Government Accountability Office will investigate the activities of President Trump's voter fraud commission after three Democratic senators asked that the agency look into the matter.

Sen. Michael Bennet Michael Farrand BennetOVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Senate Democrats demand White House fire controversial head of public lands agency Next crisis, keep people working and give them raises MORE (D-Colo.) said Thursday that the government watchdog has accepted the request to investigate the commission. Bennet, along with Sens. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.) and Amy Klobuchar Amy KlobucharBattle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates Klobuchar: GOP can't use 'raw political power right in middle of an election' MORE (D-Minn.), wrote to the agency last week asking for a probe.

In a letter to Bennet dated Wednesday, the GAO said that it had determined that such an investigation "is within the scope of its authority." The investigation will begin in about five months.

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Trump's Presidential Advisory Commission on Election Integrity has stirred controversy since it was established in May.

Trump has repeatedly claimed, without evidence, that widespread voter fraud cost him the popular vote in the 2016 presidential election. He won the Electoral College, but lost the popular vote to Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE by nearly 3 million ballots.

Critics have slammed the panel as a partisan effort to suppress voter turnout, particularly among minorities, and an effort to back up the president's claim.

Some lawmakers have also complained that the commission has not conducted its work in a transparent manner, and has ignored congressional requests for information on its activities.

"Without any PACEI response to Congressional inquiries, we fear that the manner in which the PACEI is conducting its work will prevent the public from a full and transparent understanding of the Commission's conclusions and unnecessarily diminish confidence in our democratic process," the senators' letter requesting the GAO review read.