Does a president who tries to overthrow the republic to remain in power get to keep those planning conversations secret for decades to come? Or is there a coup-plotting exception to “executive privilege”? That is the question former President Donald Trump could force federal courts to confront after his successor, President Joe Biden, on Friday approved the release of all the documents that the House committee investigating the Jan. 6 assault on the U.S. Capitol had asked for in its initial request.