Of particular interest to Mueller's team are records of the meeting Trump had with Russian government officials in the Oval Office on the day after he fired Comey.
Trump raised eyebrows when he dismissed Comey, a decision he told NBC's Lester Holt was related to the Russian Federation investigation, then headed by the former director.
The document requests provide the most details to date about the breadth of Mueller's investigation, and show that several aspects of his inquiry are focused squarely on Trump's behaviour in the White House. "He was insane, a real nut job", Trump reportedly told them.
Comey was sacked in May, while he was leading the Russian Federation investigation. Mueller's team has been looking into whether President Donald Trump attempted to obstruct justice by firing Comey.
Former federal prosecutor Peter Zeidenberg told The Journal that it was "unusual" for Mueller's team to sit down with Rosenstein given his oversight of Mueller's team's activities.
Mueller's office has provided a list of documents requested from the White House counsel's office, a legal source says. Since then, administration lawyers have been scouring White House emails and asking officials whether they have other documents or notes that may pertain to Mueller's requests.
The areas include President Trump's decision to fire FBI Director James Comey (right). Comey in later testimony claimed that the president had repeatedly entreated him to "let go" of the investigation into Flynn before ultimately dismissing him in May.
And he wants more records related to a meeting at Trump Tower that first son Donald Trump Jr., son-in-law Jared Kushner and ex-campaign manager Paul Manafort had with a Kremlin-connected lawyer in June 2016 in which the lawyer offered to dish dirt on Hillary Clinton.
"We can't comment on any specific requests being made or our conversations with the special counsel, " he said.