The legal experts have varying opinions.

To me it’s not a legal question at all, but a practical one. The answer is obviously “no,” because no conviction removes him from office, no matter how serious the crime. If President Trump, for example, held a Black Mass and sacrificed a virgin to Satan on the White House lawn, and were then convicted of murder, Trump would still be President of the United States, in charge of the nuclear codes, the military, the CIA, the FBI, etc. It doesn’t matter if he were on death row – he’d still be running the executive branch, and for all practical purposes, the country.

(And you know that Republican senators are still going to say that he was convicted by Obama judges and refuse to impeach him, even as he sits in The Big House.)

He’s not refusing to testify, but simply insisting that any congressional testimony he would provide would not go beyond his report. “We chose those words carefully, and the work speaks for itself, and the report is my testimony.”

Mueller sought to explain his thinking more fully. As an employee of the DOJ, he was bound by their guidelines. Therefore, he said a president “cannot be charged with a federal crime while he is in office. That is unconstitutional.” And he noted, “Even if the charge is kept under seal and hidden from public view, that, too, is prohibited. Charging the president with a crime was therefore not an option we could consider.” The Constitution “requires a process other than the criminal justice system to formally accuse the president of wrongdoing.”

However …

“If we had had confidence that the president clearly did not commit a crime, we would have said so.”