President Trump fired James Comey late Tuesday, and better now than never. These columns opposed Mr. Comey’s nomination by Barack Obama, and the Federal Bureau of Investigation Director has committed more than enough mistakes in the last year to be dismissed for cause.

Mr. Trump sacked Mr. Comey on the advice of Deputy Attorney General Rod Rosenstein, a former U.S. Attorney with a straight-up-the-middle reputation who was only recently confirmed by the Senate. In a memo to Attorney General Jeff Sessions, Mr. Rosenstein cited...