On the morning of May 26, Donald Trump posted a pair of tweets about voting by mail. “There is NO WAY (ZERO!) that Mail-In Ballots will be anything less than substantially fraudulent,” Trump wrote. “This will be a Rigged Election.” Soon after, a monitor flagged the tweets for violating Twitter’s “civic integrity policy,” which reads, in part, “You may not use Twitter’s services for the purpose of manipulating or interfering in elections or other civic processes.” In response, Twitter appended to the tweets an unobtrusive link that read “Get the facts about mail-in ballots” and brought users to a…