Is Congress permitted to continuously harass a President??
What has Congress accomplished in 90 days?
Congress is sovereign so it can do as it pleases. Doesn’t mean others must cooperate, Congress has almost no tools to directly enforce its will.
If they actually pull out the ability to jail someone for contempt in Congress’ own brig, that will be leveraged to hell and back against them when they lose the House again in 2020.
Eric Holder was already found in contempt of Congress, so he can be arrested and held indefinitely from the day the new Congress is sworn in.