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.
(Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)
Copyright 2016 Nexstar Broadcasting, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.