Weiner, once considered a rising star in the Democratic Party, had represented his congressional district in Brooklyn and Queens for almost 12 years before a string of sexting scandals torpedoed his career. He stepped down in 2011 after admitting to sending sexually explicit social media messages and texts to women.

But the sexting didn't stop, and a series of explicit exchanges continued in early 2016 with the 15-year-old girl from North Carolina, two highly knowledgeable sources told NBC News in September.

Weiner allegedly sent pornographic videos and made requests that the girl be nude and masturbate, the sources said. He allegedly used the alias "T Dog" with her.

♫ and the sexting never stops ♫

Disgraced former Congressman Anthony Weiner wept openly in federal court Friday as he pleaded guilty to sexting a 15-year-old girl — and broke down as he admitted to the judge: "I have a sickness, but I do not have an excuse."