As the U.S. Congress returns to work Monday, Rep. Anthony Weiner, D-N.Y., begins this week in rehab at an undisclosed location.
The congressman is taking what he calls "a short leave of absence" to get psychological treatment.
Meanwhile, calls for Weiner's resignation are growing after more lewd photos sent by the New York lawmaker were discovered over the weekend.
"Seems to me extraordinarily difficult that he can proceed to represent his constituents in an effective way given the circumstances this bizarre behavior," Rep. Steny Hoyer, D-Md., told CBS's "Face the Nation."
Rep. Debbie Wasserman Schultz, D-Fla. also called for Weiner step down, calling his behavior "indefensible."
"We have made clear that he needs to resign. He needs to focus on getting his own personal issues in order," she told NBC's "Meet the Press."
Weiner has admitted exchanging messages with several women online that ranged from being sexually suggestive to explicit.
The congressman also reportedly traded messages with a 17-year-old Delaware high school student -- although those were deemed harmless.
"I've made some pretty serious mistakes and I need to redeem myself. And I'm working hard to get back to normal and serve the people of my district the best I can," Weiner said.
On Sunday, both foes and supporters rallied outside the embattled lawmaker's district office.
"He should not be convicted in the press. If he violated a law, let him be convicted by a jury," constituent Jim Sideris said.
"He's a liar and I can never ever believe anything that this man says," Jane Deacy, a GOP district leader, said.
There has been no indication of how long Weiner's leave of absence will be. Meanwhile, his wife, Huma Abedin, is set to return to the U.S. in a few days after traveling with her boss, Secretary of State Hillary Clinton.