evidence: "Whether it is the president of the United States or a failed gubernatorial candidate, disinformation regarding election administration should be condemned and rejected," Raffensperger said, referring both to Trump’s claims and to Stacey Abrams’s 2018 Democratic run for governor. "Integrity matters. Truth matters." [...] Trump claim: Trump has repeated unfounded claims that election officials in Democratic-leaning Clark County manipulated a machine used to verify signatures to "allow large numbers of ballots to be counted that otherwise would never have passed muster." In a 46-minute video posted online, Trump claimed that officials had "intentionally lowered" the machine’s standard for matching a ballot signature to signatures on file. "This machine was set at the lowest level, according to one report," he said. "They said you could sign your name as Santa Claus and it would be accepted." [...] Trump claim: The president brought up again a baseless claim that postal workers have tampered with ballots. At his Dec. 5 rally in Georgia, Trump said whistleblowers in multiple states have testified to witnessing postal workers and election workers illegally backdating thousands of ballots, fixing ballots, filling out false birthdays, registering ineligible voters and much more. On Nov. 11 and Nov. 15, Trump tweeted about a Pennsylvania postal worker, Richard Hopkins, who alleged that two days after the election, he heard the Erie postmaster say to a supervisor that they had "messed up" by failing to backdate the postmark on ballots that arrived after Election Day.