Trump’s false attacks on voting by mail stir broad concern

Richard L. Hasen, an election law expert and a professor at the University of California, Irvine, said that unlike the president’s false claims about in-person voting, there have been sporadic problems with mail-in voting, giving Mr. Trump a kernel of truth on which to build an indictment of the entire system. “The shift has been to mail-in balloting,” Mr. Hasen said of Mr. Trump’s comments “and this is especially dangerous now because everything about our elections is being upended by the virus.”