Which U.S. senator is most vulnerable to a Trump impeachment?

The House is preparing a letter of impeachment against Sen. Bob Corker, R-Tenn., for alleged ties to Russian officials during the 2016 presidential campaign.

The letter was sent to Senate leaders Monday.

Corker has denied any wrongdoing.CORKER AND HIS SENATE PARTY’S MOTHER’S CUTTERING TWEETS IN CASE OF BOB CORKER’S SENTENCING’S NOTEDLY EXCITING PROPOSAL FOR HIS SELF-INJURY. 

The House Judiciary Committee has also asked the Judiciary Committee to investigate whether there was a quid pro quo.