Last month, when President Trump fired FBI Director James Comey, conservatives parroted the White House cover story: that Trump had terminated Comey based on the recommendations of Attorney General Jeff Sessions and Deputy Attorney General Rod Rosenstein. That story soon collapsed, leaving Trump’s apologists scrambling for other excuses. In the last week or so, some of them have settled on a new theory. They accept that Trump fired Comey because of the FBI’s Russia investigation. But Trump wasn’t trying to stop the investigation, they insist. He was just frustrated that Comey wouldn’t tell the public the truth: that Trump wasn’t personally under investigation.