In April, Trump hired former NY mayor Rudy Giuliani and two other former federal prosecutors to join his legal team.
Speaking to reporters last week, the president's newly appointed lawyer, Rudy Giuliani, railed against the inquiry, and pushed Mueller to make his findings public.
A court battle is likely if Trump's team argues that the president can't be forced to answer questions or be charged with obstruction of justice.
On Twitter Monday, Trump said: "As has been stated by numerous legal scholars, I have the absolute right to PARDON myself, but why would I do that when I have done nothing wrong?" The never-before-seen memo makes a broad case for the executive autonomy of the commander-in-chief, as the president's lawyers argue a sitting president can not be subpoenaed.
Lawyers for President Donald Trump told Robert Mueller that Trump could not have committed obstruction of justice by "virtue of his position as the chief law enforcement officer", according to a January letter to the special counsel published Saturday by the New York Times.
They also contended that nothing Mr. Trump did violated obstruction-of-justice statutes, making both a technical parsing of what one such law covers and a broad constitutional argument that Congress can not infringe on how he exercises his power to supervise the executive branch.
The letter, which was penned by Trump lawyers Jay Sekulow and John Dowd, appears to lay out the legal team's view of the extent of the president's power - and may foreshadow a coming subpoena battle between Mueller and Trump.
The letter did not explicitly describe the possibility of Trump pardoning himself. In their letter, Trump's lawyers contested that account, but also argued that the president could not have been attempting to interfere in an investigation he was not aware was underway.
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Trump's lawyers in the 20-page letter wrote that the president can fire the FBI director at any time-as acknowledged by former FBI Director James Comey, whom Trump fired-and that "No President has ever faced charges of obstruction merely for exercising his constitutional authority".
The White House declined to comment, referring to outside counsel. The letter lists 16 subject areas Mueller's team meant to question Trump about, including his firing of FBI Director James Comey. Trump wrote. "Should be looking at Dems corruption instead?" Among those areas of interest is Mr. Trump's reaction to Attorney General Jeff Sessions' decision to recuse himself in the Russian Federation investigation.
"In light of these voluntary offerings, your office clearly lacks the requisite need to personally interview the president", the letter read.
For more than a year, speculation has been rife about the relationship between Trump and Sessions - in fact, it's been described as "toxic" and "dysfunctional".
It's unclear whether prosecutors believe they have enough evidence to charge the president with obstructing justice.
Harvard Law School professor Jack Goldsmith told the Times that the intersection of presidential authority and a Justice Department investigation is an "open question" and that it's not clear whether the executive office carries the power to shut down inquiries and grant a kind of immunity to the president.