7:30AM BST 24 Aug 2012
American Armstrong said in a statement that he is "finished with this nonsense" and insisted he is innocent but did not want to spend any further effort clearing his name.
He said: "There comes a point in every man's life when he has to say, 'Enough is enough'. For me, that time is now.
"I have been dealing with claims that I cheated and had an unfair advantage in winning my seven Tours since 1999."
However Armstrong's achievements are set to be wiped from the record books.
Asked what actions USADA intended to impose, spokeswoman Annie Skinner said in an email: "A loss of all results from August 1, 1998 and a lifetime ban from participating any sport sanctioned by a signatory to the WADA Code."
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