The New York Democrat was sentenced to 21 months behind bars after pleading guilty to sending sexually explicit material to a teenage girl.
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He is serving his time in Massachusetts and will be released from prison on May 14th, 2019 for good behavior.
Weiner was sentenced in September 2017 by a judge who said Weiner's crime resulted from a "very strong compulsion."
A tearful Weiner said he was undergoing therapy and had been "a very sick man for a very long time."
Amid a sexting controversy involving women, Weiner resigned his House seat in 2011 only to have new allegations doom his 2013 run for mayor.
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A criminal probe into his sexting with a high school student intruded into Democrat Hillary Clinton's bid for the White House.
Then-FBI Director James Comey announced in late October 2016 that he was reopening the probe of Clinton's use of a private computer server after emails between Clinton and Weiner's wife, Huma Abedin - formerly Clinton's closest aide - were found on Weiner's laptop computer.
Two days before Election Day, the FBI declared there was nothing new in the emails.
(The Associated Press contributed to this report)
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