U.S. Representative Michele Bachmann, who was best known for her failed presidential bid in 2012, was being investigated for alleged campaign finance violations during the presidential run, her attorney confirmed Monday.

The probe was first reported by news site The Daily Beast. It said Office of Congressional Ethics (OCE) was interviewing Bachmann staffers over alleged campaign finance irregularities.

Law firm Patton Boggs, which represents Bachmann, confirmed the probe, but denied Bachmann had committed any wrongdoing. It said in a statement that there are "no allegations that the congresswoman engaged in any wrongdoing. We are constructively engaged with the OCE and are confident that at the end of their review the OCE Board will conclude that Congresswoman Bachmann did not do anything inappropriate."

According to reports, former Bachmann campaign staffer Peter Waldron has alleged Bachmann used funds from her leadership PAC to cover the consultant costs for her presidential race.

In a complaint to the Federal Election Campaign, Waldron also claimed that the Bachmann campaign improperly hid payments to Kent Sorenson, an Iowa state senator who ran the Bachmann campaign in the state.

Bachmann, a favorite of the Tea Party movement and a vocal critic of President Barack Obama, dropped out of the presidential race in January 2012, after finishing a disappointing sixth in the Iowa caucuses. She was reelected to represent her Minnesota district in the House later that year.