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WEST PALM BEACH, Fla. (AP) -- Democratic U.S. Rep. Tim Mahoney, married with a child, declined to say Monday whether he had carried on an affair with a former aide and paid to keep her quiet, then called for an investigation by the House ethics committee into his own conduct.

Mahoney issued his statement hours after ABC News reported on its Web site that he had agreed to pay $121,000 in March to a former mistress and staff member after being threatened with a sexual harassment lawsuit. Mahoney said he would be vindicated.

House Speaker Nancy Pelosi also called for an investigation.

The network, citing unnamed current and former Mahoney staff members, said the congressman began his affair with Patricia Allen, 50, in 2006 while he was campaigning for Congress, promising to return morals to Washington.

Mahoney won the race after former Republican U.S. Rep. Mark Foley resigned when it was revealed he sent lurid Internet messages to male teenage pages who had worked on Capitol Hill. Foley was cleared of criminal wrongdoing by state and federal authorities.

Telephone messages left by The Associated Press for Mahoney and congressional and campaign staff members of his were not returned Monday.

A Mahoney spokesperson told ABC that Allen resigned willingly and "has not received any special payment from campaign funds."

"While these allegations are based on hearsay, I believe that my constituents need a full accounting," Mahoney, who faces a Republican challenger in November's election, said in the release. "As such, I have requested the House Ethics Committee to review these allegations. I am confident that when the facts are presented that I will be vindicated."

Added Pelosi in her own statement: "These charges must be immediately and thoroughly investigated."

In addition to the cash payment, ABC News reported that Mahoney promised Allen a $50,000 a year job for two years at the agency that handles his campaign advertising.

That company, Nashville, Tenn.-based Fletcher Rowley Chao Riddle Inc., resigned from Mahoney's campaign later Monday.

"Tim Mahoney apparently included our company in a secret legal settlement without the knowledge of our firm. Our firm did not agree to any legal settlement," CEO Bill Fletcher said in a release. "If these allegations are true, Tim Mahoney's actions are unacceptable and not in line with FRCR's business ethics."

Mahoney could be facing a tough challenge in the November election in a district that leans slightly Republican. Former Army officer Tom Rooney, a lawyer whose family owns the Pittsburgh Steelers and a Palm Beach County dog track, is mounting a well-funded race aiming to give the district back to Republicans.

Rep. Rahm Emanuel of Illinois, chair of the House Democratic Caucus, heard rumors about an affair in early 2007 and confronted Mahoney, a spokeswoman said Monday.

"Upon hearing a rumor, Congressman Emanuel confronted Congressman Mahoney, told him he was in public life and had a responsibility to act accordingly and appropriately, and urged him to do so," the spokeswoman said. "They had no further conversations on this topic."

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