Eric H. Holder Jr., the former attorney general, accused President Trump on Tuesday of trying to disenfranchise millions of voters by damaging the Postal Service and its ability to handle mail-in voting in the November election.
Mr. Holder, who served under President Barack Obama, told Pennsylvania Democrats during a breakfast videoconference that Mr. Trump would stop at nothing to win a second term.
“Our democracy is actually on the ballot this November,” Mr. Holder said.
He said he was alarmed by Mr. Trump’s unsubstantiated claims that voter fraud has been widespread.
“He just came right out and said it that he’s undermining a cherished institution,” Mr. Holder said of cuts to the Postal Service, adding that he thought Mr. Trump would do anything that he believed was in his own self-interest.
Mr. Holder’s comments came the day after Democrats on the House Judiciary Committee urged the F.B.I. to open a criminal investigation into actions by the postmaster general, Louis DeJoy, and the Postal Service’s Board of Governors that may have caused mail delays.
Since leaving office, Mr. Holder has led the National Democratic Redistricting Committee, a group that opposes gerrymandering by the Republican Party.