Grassley is going to pressure Steele to give up the goods on Comey, McCabe and others.
The idea is to expose the differences in the info recorded in the 302s from Steele vs. the info from Fusion and others. Grassley wants the FBI to declare whether Steele or Fusion, etc, is telling the truth.
Pressure from the House doesn’t seem to scare anyone involved. Almost all have claimed the 5th before they even appear (if they even do appear.) Either a Special Prosecutor needs to be empowered, or a Grand Jury, or both. That would start at Justice, and hopefully Sessions will grow a pair.