The Post reports Mueller's team wants to know why Trump fired former FBI Director James Comey and former national security adviser Michael Flynn. It's being interpreted as a sign the investigation may focus on possible obstruction of justice by either the president or those close to him.
It's unclear if the special counsel will get to talk to the president. But the two sides are negotiating terms for the interview. Trump's attorneys could make a proposal as soon as next week.
This news comes on the same day The New York Times revealed Mueller's team spoke with Comey last year and that the special counsel interviewed Attorney General Jeff Sessions for several hours last week.
Mueller also reportedly wants to press Trump on his alleged efforts to remove Sessions from his attorney general post, which the special counsel believes could show a pattern of behavior.