Tony Snow,White House press secretary, died in Washington, D.C., on Saturday of colon cancer at the age of 53. (ABC)
Bush said his family's thoughts and prayers are with Snow's wife, Jill, and their three children.
White House aides told ABC News that the president tried to phone Snow last month but Snow was unable to speak to him. It was a sign of how Snow's condition was deteriorating.
Our prayers are with Tony's family and friends.