Sen. Bob Casey, D-Pa., waves as he takes the stage during the first day of the Democratic National Convention in Philadelphia, Pa., July 25, 2016. Paul Sancya AP
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Several state, local, and federal election officials have said that voter fraud is extremely rare. Trump’s call for supporters to be poll watchers seems to have caused a difference of opinion with the Republican National Committee.

The Los Angeles Times reported that John Phillippe, Jr., the RNC’s general counsel, wrote in a legal brief last week that he sent a memo to the party’s staff that said the “RNC has no role and will not partake in any voter fraud or poll watching activities” and will not participate in “any ballot security efforts by other organizations, including Mr. Trump’s presidential campaign.”