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Married New York congressman Anthony Weiner has admitted sending a close-up picture of his underpants to a young woman, but says he will not resign.
The Democratic representative also acknowledged "inappropriate" communications with women online.
Mr Weiner had initially said his Twitter account had been hacked when a photo of a man's crotch was sent from it last week.
On Monday he admitted this was not true, saying that he had "panicked".
A tearful Mr Weiner told a news conference he was "deeply ashamed of my terrible judgement".
"I'm deeply regretting what I have done and I'm not resigning," he said, apologising for any pain caused to his family, constituents, supporters and staff.
He said he had intended to send the close-up picture of himself in his underpants as a direct message on Twitter.
"Once I realised that I had posted to Twitter I panicked, I took it down and said that I had been hacked," Mr Weiner said.
Source: BBC