A federal ethics panel is investigating allegations that Michele Bachmann's short-lived presidential campaign illegally used campaign funds for under-the-table payments to staffers.

A former Iowa staff member filed a complaint with the Federal Election Commission in January, accusing the campaign of illegally accepting funds from political action committees and failing to pay its workers.

Campaign lawyer William McGinley has denied all allegations, and the congresswoman has not been formally accused of wrongdoing herself.

From ABC's report:

Bachmann has not been formally accused of any wrong doing, but staffers said they had been questioned by federal authorities. The investigators are working on behalf of the Office of Congressional Ethics.

Bachmann's attorney confirmed to ABC News.com that Bachmann was being probed by the OCE, but denied any wrongdoing.

"There are no allegations that the congresswoman engaged in any wrongdoing," campaign lawyer William McGinley told ABCNews.com in a statement.

"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," he said.