U.S. Rep. Michael Grimm's lawyer says the New York Republican "fully embraces and accepts his responsibility for his actions."
Grimm said in a statement late Monday that he will resign effective Jan. 5.
He pleaded guilty to tax evasion last week. At the time, he vowed to stay in Congress as long as he could. But he now says he cannot give the job his full attention anymore.
The new Congress is scheduled to open Jan. 6, and Grimm's presence would have been a distraction for Republicans who will control both the House and the Senate.
Grimm's lawyer, Stuart N. Kaplan, said Tuesday that Grimm "shows great humility in moving forward for himself, as well as his constituents, to resign."
Grimm's sentencing is scheduled for June 8.