The Committee on Standards of Official Conduct said Thursday an investigation and gathering of information was taking place.
Massa said that he recently learned that a member of his staff believed I had made statements that made him feel 'uncomfortable,' Massa said in a released statement.
I know that my own language failed to meet the standards that I set for all around me and myself, he said.
He said he would resign on Monday at 5p.m. Massa represented New York's 29th Congressional District.
Massa had been elected in November 2008. He announced in November of last year that he would not seek re-election following a cancer scare in December.