WASHINGTON – Amid rising calls for an ethics investigation into his behavior, Rep. John Conyers, D-Mich., confirmed that he reached a financial settlement with a former staffer who accused him of sexual harassment but stressed that he did not admit fault in the case.

"I expressly and vehemently denied the allegations made against me, and continue to do so," Conyers said Tuesday in a formal statement, his first since BuzzFeed reported details of the settlement late Monday.

"My office resolved the allegations – with an express denial of liability – to save all involved from the rigors of protracted litigation. That should not be lost in the narrative," he stated.

Conyers, the top Democrat on the powerful House Judiciary Committee, denied wrongdoing as colleagues called for a formal ethics investigation into allegations that he made unwanted sexual advances toward female staff.

"The allegations against Ranking Member Conyers are extremely serious and deeply troubling," said Rep. Jerrold Nadler of New York, Judiciary's second most senior Democrat, in a statement.

"Obviously, these allegations must be investigated promptly by the Ethics Committee. There can be no tolerance for behavior that subjects women to the kind of conduct alleged," Nadler stated.

Rep. Jackie Speier, D-Calif., a leading voice on the problem of sexual harassment on Capitol Hill, drew attention to evidence that Conyers handled the settlement by placing his accuser back on his payroll.

"Beyond the sexual harassment allegations are allegations that call into question the amount of money that is used to settle sexual harassment cases, and whether some Members are using their tax payer-funded office budgets to make settlements under the guise of severance payments," Speier said in a statement, also calling for an ethics investigation.

Citing documents from the case, BuzzFeed News reported late Monday that Conyers settled a wrongful dismissal complaint in 2015 with an unidentified woman who alleged that he "repeatedly made sexual advances to female staff that included requests for sex acts." The report included other allegations of harassment by Conyers.

Speaker Paul D. Ryan, R-Wis., called the report "extremely troubling" in a statement. He noted a recent rules change requiring members and staff to undergo anti-harassment training and said the House Administration Committee is reviewing congressional workplace policies.

"Additional reforms to the system are under consideration as the committee continues its review," Ryan stated Tuesday. "People who work in the House deserve and are entitled to a workplace without harassment or discrimination."

House Minority Leader Nancy Pelosi, D-Calif., denied knowledge of the alleged settlement in a statement first shared with BuzzFeed, citing the requirement that the parties keep their agreement confidential.