Crime and coverup

As more and more evidence piles up pointing to collusion between the tRump campaign and various Russian entities, it becomes more and more difficult for the GOP to continue running interference for The Donald and his administration.  More than 30 republicans are already heading for the exits and each "retirement" makes democratic control of the House more likely.  Imagine democrats with subpoena powers giving the White House a proctology examination for 2 full years!  In the process, they will probably also uncover the conspiracy of obstruction the republican party has deployed to cover up their president's crimes.  I wonder if some of them may be vulnerable to obstruction of justice charges.