From the March 28 edition of Fox News' Hannity:
SEAN HANNITY (HOST): When you put all of this together there was far more involvement with the White House and Barack Obama in all of this than anybody knew.
GREGG JARRETT: Oh, absolutely. To believe that the president didn't know that there was an investigation of Donald Trump, candidate for president, is to believe in the tooth fairy.
HANNITY: I don’t believe in the, does that make him a witness, potential witness?
JARRETT: Oh absolutely it makes him a witness.
HANNITY: And he should be subpoenaed, no?
JARRETT: He should be.
This is why there should be a special counsel, there ought to be a grand jury and not subpoenas issued, a warrant to go in and seize these documents. Don't let the DOJ and the FBI decide which ones they want to turn over. They’re going to hide the incriminating documents or redact material information. Get a warrant. Seize them. Bring in Federal Marshals.