Legal experts said Trump's disclosures put into question whether his conversations with Comey are protected by presidential executive privilege, a legal doctrine that is not constitutionally guaranteed but that historically has protected a president's communications. Trump's public discussions of the Comey conversations may have opened the door for Congress to press Comey on what was said during his conversations with Trump, wrote Laurence H. Tribe, a professor of constitutional law at Harvard Law School in a Twitter post (below):
https://twitter.com/tribelaw/status/862878028849917953
University of Texas School of Law Professor Stephen I. Vladeck, also a constitutional law expert, told ThinkProgress that a president's public comments can waive executive privilege for a particular topic.
"Certainly, the more President Trump opens his mouth and/or his Twitter account, the harder it will be for him and his associates to prevail in a fight over executive privilege — but that won't stop them from invoking it, and from requiring Congress or the courts to sort it out," wrote Vladeck, in an email.
The White House is not supposed to speak to the FBI about investigations, except through the Attorney General or Deputy Attorney General, in order to avoid political interference with investigations. Trump appears to have violated that prohibition," wrote constitutional law expert David Cole in an email to ThinkProgress. Cole is national legal director at the American Civil Liberties Union and is on leave from teaching at the Georgetown University Law Center.