The special counsel in the investigation into Russia's meddling in the election wants to know about the president's actions while in office.
Documents on Mr Trump's sacking of the Federal Bureau of Investigation director and his son's meeting with a Russian lawyer are the target of the inquiry, report United States media.
Specifically, Mueller appears to be closely going through White House documents about most of the key events related to potential collusion and potential obstruction of justice, with a close focus on just what President Trump's role was.
Days after firing Comey, Trump met with Russian Foreign Minister Sergei Lavrov and then Russian Ambassor to the U.S., Sergey Kislyak at the Oval Office, and revealed some classified information to them. Additionally, the special counsel has asked for documents about how the White House responded to questions from The Times about a June 2016 meeting at Trump Tower.
Ty Cobb, the White House lawyer handling requests from Mueller's office, told Reuters, "Out of respect for the special counsel and its process, the White House does not comment on exchanges between the special counsel and the White House".
The request was expected, a source said. It is not clear whether Mueller has made separate document requests elsewhere to examine those subjects.More news: Battleground Alabama: Donald Trump vs Steve Bannon
More news: Liverpool FC to ring the changes for League Cup
More news: Iraqi Kurdish parliament approves independence referendum
Mr Mueller's probe into potential ties between Russian Federation and the Trump campaign appears to have heated up in recent weeks, with the special investigator also reportedly asking the White House if he can interview staffers as well as current and former top aides to the President.
The list of categories from Mueller reads like a greatest hits of the Trump team's missteps.
Senator Chris Coons has co-sponsored a measure that would keep special counsel Robert Mueller from being fired as he investigates whether there was collusion between the Trump campaign and Russian Federation during the presidential campaign.
USA officials said Flynn had told the vice president that he had only exchanged holiday greetings with Kislyak, when in fact the two men had discussed economic sanctions against Russian Federation. The firestorm over his dismissal led to the appointment of Mueller as special counsel.
Comey was sacked in May, while he was leading the Russian Federation investigation.
They say special counsel Robert Mueller has outlined to the White House 13 areas of interest to his investigation.