President Bush says the biggest source of US generosity isn't the government -- it's "the good heart of the American people."
Bush is asking Americans to "join in a broad humanitarian relief effort" to help victims of the Indian Ocean tsunami.
Bush has asked his father, former President Bush, and former President Clinton to lead a national fund-raising drive. Americans will be asked to give to charities that are already playing a role in the relief effort.
Bush says all Americans who can help should do so.
He says the US is taking "a leading role" in helping the survivors.
The administration has already pledged 350 (m) million dollars in aid, but officials say that number could be adjusted.