Copernicus
Industrial Grade Linguist
That precedent has already been established. Presidents can be compelled to testify, especially if subpoenaed. Trump's lawyers are negotiating, and they appear to be desperate. One option they tossed out was that he could just sign an affidavit affirming that there was no collusion and that he has done nothing illegal. There have been four Presidents, beginning with Ford, who have testified under oath in the past. Clinton went before a grand jury. I don't know what would happen if Trump decided to ignore a subpoena or whether it would come to that, but I wouldn't be totally surprised. He has no respect for the law and rightfully believes that he is above it, as long as Congress refuses to impeach. And they almost certainly will refuse to impeach him.A lot of press outlets are reporting that Mueller wants to interview Trump directly. Hopefully it means that the investigation is getting near the end. And we may see a precedence-setting determination on if a president can be forced to testify. Time to get out more popcorn!
Frankly, I am beginning to doubt that an interview would extract much information from Trump. He seems not to perform very well under pressure and seems even more scatterbrained now than in the past. What would investigators make of rambling ungrammatical responses? Is he lying, if he is incoherent? He fares best around people who feel that they know how to interpret his tweets.