In a move that could foreshadow his approach to November’s presidential election, Trump said Democrats were deliberately adding one of the few polling locations over the weekend in Lancaster, where it was likely to benefit Democratic voters. “They are trying to steal another election. It’s all rigged out there. These votes must not count. SCAM!,” he tweeted…

While Trump has long railed, without evidence, that elections are tainted by voter fraud, the increased focus on vote-by-mail amid the pandemic could offer a new thread for him to pull on to undermine confidence in elections this year. Several studies have shown voter fraud is not a widespread problem.

“Given that the president has been making unsubstantiated voter fraud comments for years, I expect that these comments will continue,” said Richard Hasen, a professor of election law at the University of California, Irvine. “The comments are very worrisome because they increase the chances that the president’s supporters would not accept the election results as legitimate should he lose in November.”