Gowdy, for once, is exactly right.
If Rosenstein has done bad, its up to his boss to fire him. The chances that the Senate will do it are zero.
Congress is Constitionally tasked with oversight of the department of justice and the FBI. Rosenstein is stonewalling Congress. Therefore, Congress is with its powers and its right to impeach him and remove him from office.
Rosenstein is completely crazy and should have been both impeached and held in contempt by at the latest Monday of last week.