...Since Dowd gave him that information, Trump — as well as his aides, surrogates, and some Republican members of Congress — has engaged in an unprecedented campaign to discredit specific senior bureau officials and the FBI as an institution.

The FBI officials Trump has targeted are Andrew McCabe, the current deputy FBI director and who was briefly acting FBI director after Comey’s firing; Jim Rybicki, Comey’s chief of staff and senior counselor; and James Baker, formerly the FBI’s general counsel. Those same three officials were first identified as possible corroborating witnesses for Comey in a June 7 article in Vox. Comey confirmed in congressional testimony the following day that he confided in the three men.

In the past, presidents have attacked special counsels and prosecutors who have investigated them, calling them partisan and unfair. But no previous president has attacked a long-standing American institution such as the FBI — or specific FBI agents and law enforcement officials.

Mueller has asked senior members of the administration questions in recent months indicating that prosecutors might consider Trump’s actions also to be an effort to intimidate government officials — in this case FBI officials — from testifying against him...