Belfast, Northern Ireland ? The peace process faces a new challenge as Northern Ireland’s leader was forced to step down — at least temporarily — amid outrage following revelations of his wife’s affair with a teenager.

In an emotional statement Monday, First Minister Peter Robinson said he would step aside for a few weeks to answer questions about his wife’s romantic and financial dealings with the 19-year-old for whom she helped raised tens of thousands of dollars when she was 58.

Iris Robinson, also a lawmaker, said last week that she began the affair less than two years ago while she was suffering a bout of mental illness and comforting someone after a family death. Giving few details, she said she had encouraged friends to give her lover financial support.

The British Broadcasting Corp. reported that Iris Robinson allegedly solicited 50,000 pounds ($80,000) from people in business so her lover could open a restaurant. The BBC suggests Peter Robinson acted improperly by failing to alert parliamentary authorities about the financial transactions.

The scandal has outraged Peter Robinson’s socially conservative Protestant power base, and threatened to undermine the Democratic Unionist Party’s partnership with the Catholic Sinn Fein — critical to maintaining Northern Ireland’s shaky coalition government.

Looking pale and drawn on Monday, Peter Robinson said his wife was now receiving psychiatric treatment and that he was stepping down to deal with family matters and to allow an inquiry to take place. He denied any wrongdoing.

“I continue to contend I have acted ethically, and it is particularly painful at this time of great personal trauma that I have to defend myself from an unfounded and mischievous allegation,” he said.

If Robinson had resigned outright, Britain’s secretary for state Shaun Woodward had said he would have to call a snap Assembly election, unless all sides of the power-sharing executive agreed on a successor within seven days.

Robinson’s temporary departure sidesteps the need for elections, but his party’s partnership with Sinn Fein is already badly strained by disagreements over who will run the province’s justice system. Officials in Britain have expressed concern that the turmoil could hurt the peace process at a sensitive time.