I remember Nixon well - the senators tried to convince him to stay on, assuring him they had the votes. But Nixon said no.
Rush had a long segment Friday on the text of the law, and said they clearly do not have authority to go into his business and tax returns. I believe Trump knows this and has already telegraphed his intention to take action - exactly what, only he knows.
After about a week, those senators who had urged Nixon to fight were replaced by a Goldwater group that told him to get out of D.C. while he could.
C.