Google "jane harman alberto gonzales". George W. Bush's Attorney General was apparently "twisting Rep. Jane Harman's arm" over some moderately bad things that FBI or somebody caught Harman saying to some AIPAC people being surveilled.

That was in 2009. I remember being kind of stunned that nobody seemed to care that the executive branch blackmailed an elected Rep. Log rolling and pork barrelling is fine, but blackmail seems like a bridge too far.