Investigators into Russian meddling in the U.S. presidential elections are now also probing whether White House officials have engaged in a cover-up, according to members of Congress who were briefed Friday by Deputy Attorney General Rod Rosenstein.

That avenue of investigation was added in recent weeks after assertions by former FBI Director James Comey that President Donald Trump had tried to dissuade him from pressing an investigation into the actions of Trump’s first national security adviser, retired Army Lt. Gen. Michael Flynn, members of Congress said, though it was not clear whom that part of the probe might target.