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Special Counsel Robert Mueller reportedly warned of a subpoena for Donald Trump to appear before a grand jury after the president's lawyers insisted he had no obligation to talk with federal investigators probing Russia’s interference in the 2016 presidential campaign.

The Washington Post reports that the exchange took place in a tense meeting in early March between the lawyers and special counsel. The flare-up is said to have led to weeks of turmoil among Trump’s attorneys as they debated how to deal with the special counsel’s request for an interview, a dispute that ultimately led to the president's lead attorney John Dowd resigning.

A list of proposed questions Mueller allegedly has for Trump was published by The New York Times on Monday. The questions deal chiefly with the president’s firings of the FBI director and his first national security adviser, a 2016 Trump Tower meeting between campaign officials and Russians offering dirt on Hillary Clinton, as well as some questions about the president’s businesses.