He says longstanding DOJ policy affected his decision on this.
"The report is my testimony."
-Affirms DOJ restrictions on indicting a president guided his handling of obstruction case
-Says he won’t say anything to Congress beyond what’s in his report
-Asked if he’d comply with a congressional subpoena: “No questions.”
"Given that ... Mueller was unable to pursue criminal charges against the President, it falls to Congress to respond to the crimes, lies and other wrongdoing of President Trump – and we will do so."
"[T]he opinion says that the Constitution requires a process other than the criminal justice system to formally accuse a sitting president of wrongdoing."