Armstrong says last few weeks 'difficult'
1 of 1
Bike riders wait at the starting gate at the Livestrong Challenge Austin bike ride Sunday, Oct. 21, 2012, in Austin, Texas.
Photos: Kailua Fourth of July Parade
Photos: Walter J. MacFarlane regatta, July 4, 2015
Photos: Solar Impulse 2 lands in Hawaii, July 3
More Photo Galleries »