Adding to the “mountain of evidence” that President Donald Trump has obstructed justice and indicating that special counsel Robert Mueller’s probe is continuing to expand, the New York Times reported late Tuesday that Mueller is examining a meeting last March during which Trump ordered Attorney General Jeff Sessions to reverse his recusal from the FBI’s Russia investigation.

After ranting to aides that “he needed a loyalist overseeing” the Russia probe, Trump told Sessions during dinner at Mar-a-Lago to walk back his decision to recuse himself from the investigation—a move that was required by Justice Department guidelines that “are in place to prevent the sort of political meddling the president tried to engage in,” the Times notes.

Sessions ultimately refused Trump’s demand.

The special counsel’s reported interest Trump’s meeting with the attorney general “demonstrates Mr. Sessions’ overlooked role as a key witness in the investigation into whether Mr. Trump tried to obstruct” the Russia investigation, the Times observed. “It also suggests that the obstruction investigation is broader than it is widely understood to be—encompassing not only the president’s interactions with and firing of the former F.B.I. director, James B. Comey.”