WASHINGTON Rep. John Conyers (D-Mich.) now faces an additional accusation of sexual misconduct from a former female staffer, as he announced his retirement from Congress Tuesday morning.

Elisa Grubbs, who worked for Conyers in different roles from 2001 to 2013, revealed that the veteran Democratic congressman groped her, according to an affidavit released Monday night, and said that such behavior was a regular part of life while working in the office of Rep. Conyers.

Rep. Conyers slid his hand up my skirt and rubbed my thighs while I was sitting next to him in the front row of a church, Grubbs said in the affidavit, released by her attorney Lisa Bloom .

The newest accusation came shortly before Conyers, 88, the longest-serving current member of the House, announced his retirement from Congress, during an appearance on a Detroit radio show Tuesday morning, after mounting pressure from Democratic leaders who have called on him to resign.