HE'S GONNA HAVE TO FIRE AN AWFUL LOT OF INVESTIGATORS:

The officials said Coats, Rogers and Ledgett would appear voluntarily, though it remains unclear whether they will describe in full their conversations with Trump and other top officials or will be directed by the White House to invoke executive privilege. It is doubtful that the White House could ultimately use executive privilege to try to block them from speaking to Mueller's investigators. Experts point out that the Supreme Court ruled during the Watergate scandal that officials cannot use privilege to withhold evidence in criminal prosecutions.

The obstruction-of-justice investigation of the president began days after Comey was fired on May 9, according to people familiar with the matter. Mueller's office has taken up that work, and the preliminary interviews scheduled with intelligence officials indicate that his team is actively pursuing potential witnesses inside and outside the government.

The interviews suggest that Mueller sees the question of attempted obstruction of justice as more than just a "he said, he said" dispute between the president and the fired FBI director, an official said.

Investigating Trump for possible crimes is a complicated affair, even if convincing evidence of a crime were found. The Justice Department has long held that it would not be appropriate to indict a sitting president. Instead, experts say, the onus would be on Congress to review any findings of criminal misconduct and then decide whether to initiate impeachment proceedings.

Comey confirmed publicly in congressional testimony on March 20 that the bureau was investigating possible coordination between the Trump campaign and the Russians. [...]

As part of the probe, the special counsel has also gathered Comey's written accounts of his conversations with Trump. The president has accused Comey of lying about those encounters.

Mueller is overseeing a host of investigations involving people who are or were in Trump's orbit, people familiar with the probe said. The investigation is examining possible contacts with Russian operatives as well as any suspicious financial activity related to those individuals.

A source sent me RNC/Trump talking points for Repubs seeking to discredit tonight's WaPo scoop on Mueller investigating Trump obstruction --> pic.twitter.com/ctwy2si9A7

— Philip Rucker (@PhilipRucker) June 15, 2017

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