Washington (CNN) - Longtime Democratic Rep. Rob Andrews announced Tuesday that he's stepping down from Congress later this month.
The congressman from southern New Jersey is leaving Capitol Hill to pursue a position with a leading law firm in Philadelphia.
"In very recent days I was asked to consider heading up the government affairs practice of a very prestigious Philadelphia law firm which my family has very deep and personal connections. It' s a firm run by people who have been friends and mentors of mine for a very, very long time," he said at a news conference Tuesday.
Andrews said his decision was not "a reflection on the negativity surrounding the Congress or the politics in Washington."
The 12-term representative is currently under investigation by the House Ethics Committee. The panel is reportedly looking into allegations that Andrews misused campaign funds to pay for a family vacation to Europe.
Andrews represents New Jersey's 1st Congressional District, which covers the Philadelphia suburbs in the southern part of the Garden State. The district is considered safe for Democrats.
The 56-year-old Andrews is an ally of House Minority Leader Nancy Pelosi. Two other close Pelosi allies, Reps. George Miller and Henry Waxman, recently announced they would retire at the end of the year rather than run for re-election.
Democrats need to win back a challenging 17 GOP-held House seats in November's midterm elections to reclaim control of the chamber.
CNN Senior Congressional Producer Deirdre Walsh and CNN's Jason Seher contributed to this report.