Twitter staff warned Trump’s team previously that a May 20 tweet about voter fraud risked triggering the company to take action, according to a person familiar with the matter. That tweet wrongly said Michigan had sent absentee ballots to people ahead of the primaries. In fact, Michigan had sent absentee ballot applications. Mr. Trump deleted the tweet…

In the instance of Mr. Trump’s tweets about the conspiracies surrounding the Scarborough aide’s death, a spokesman for Twitter said the messages didn’t qualify as harassment under the company’s policy because the people mentioned in the posts are public figures.