The US constitution is very clear on how a sitting president can be impeached for high crimes and misdemeanors by Congress. However, it’s still not clear whether a sitting president can face criminal charges.
Stone was indicted in the Robert Mueller probe on Russian collusion and he’s expected to be charged with lying to Congress and obstructing the investigation.
William Barr, the nominee for Attorney General, has said that he will allow the special counsel Robert Mueller to finish his investigation into Russian meddling in the 2016 US election, if confirmed
Deputy Attorney General Rod Rosenstein is expected to resign as soon as William Barr, Trump’s nominee for Attorney General is confirmed. His office has been in charge of overseeing the Mueller investigation into possible collusion with Russia.