United States forward Landon Donovan stretches with assistance from a trainer in preparation for the World Cup soccer tournament on Thursday, May 22, 2014, in Stanford, Calif. (AP Photo/Ben Margot)
United States goalie Tim Howard, right, practices during training in preparation for the World Cup soccer tournament on Thursday, May 22, 2014, in Stanford, Calif. (AP Photo/Ben Margot)
United States goalie Tim Howard rests before a practice in preparation for the World Cup soccer tournament on Thursday, May 22, 2014, in Stanford, Calif. (AP Photo/Ben Margot)
United States soccer coach Jürgen Klinsmann, right, speaks with goalie coach Chris Woods during training in preparation for the World Cup soccer tournament on Thursday, May 22, 2014, in Stanford, Calif. (AP Photo/Ben Margot)
U.S. goalie Tim Howard, second from right, and teammates train for the World Cup soccer tournament on Thursday, May 22, 2014, in Stanford, Calif. (AP Photo/Ben Margot)
United States goalie Tim Howard, second from right, works out with teammates during training in preparation for the World Cup soccer tournament on Thursday, May 22, 2014, in Stanford, Calif. (AP Photo/Ben Margot)
United States head coach Jurgen Klinsmann smiles as his team trains in preparation for the World Cup soccer tournament on Wednesday, May 21, 2014, in Stanford , Calif. (AP Photo/Marcio Jose Sanchez)
U.S. men's soccer coach Jurgen Klinsmann answers questions during training camp in preparation for the World Cup, Wednesday, May 21, 2014, in Stanford, Calif. (AP Photo/Marcio Jose Sanchez)
U.S. men's soccer coach Jurgen Klinsmann fields questions during the team's training camp in preparation for the World Cup, Wednesday, May 21, 2014, in Stanford, Calif. (AP Photo/Marcio Jose Sanchez)