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(AP) -- U.S. Anti-Doping Agency chief executive Travis Tygart says the agency will ban Lance Armstrong from cycling for life and strip him of his seven Tour de France titles for doping.

Armstrong on Thursday night dropped any further challenges to USADA's allegations that he took performance-enhancing drugs to win cycling's premier event from 1999-2005.

Armstrong says USADA doesn't have the authority to vacate his Tour titles.

 However, Tygart told The Associated Press that USADA can do it.

Tygart called the Armstrong case a "heartbreaking" example of a win-at-all costs approach to sports.

Armstrong says he is innocent, but announced Thursday night that he has decided against fighting USADA because he is weary of the doping accusations that have dogged him for years

Says Armstrong: "There comes a point in every man's life when he has to say, "Enough is enough." For me, that time is now."
 
Armstrong called the USADA investigation an "unconstitutional witch hunt."

(Copyright ©2012 by The Associated Press. All Rights Reserved.)