During a news conference at Chicago's Museum of Science and Industry, Bush once again took North Korea to task for refusing to negotiate over its nuclear weapons program and this week's test-firing of seven missiles.
"He's made agreements in the past. He didn't live up to them," Bush said, going on to cite specifics.
"You've got to wonder whether the man's word means anything."
Bush said he does not understand Kin's intentions.
"Is he trying to force us to do something by defying the world?" Bush asked.
Bush said it is imperative that North Korea understand the world is speaking with one voice on this issue and that's why the issue now is before the U.N. Security Council.
"There's a way forward for him to help his people. I believe we need to make that choice clear to him with more than once voice," Bush said.