President Bush says he and his South Korean counterpart, Roh Moo-hyun, speak with "one voice" on the need to rid the Korean peninsula of nuclear weapons.
The two leaders met at the White House on Friday to discuss efforts to encourage North Korea to resume six-party talks, stalled since last year.
Mr. Bush says North Korea has yet to respond to a set of incentives proposed last year, if Pyongyang ends its nuclear weapons program.
Mr. Roh said there are minor differences between South Korea and the United States on the North Korean issue, but expressed hope the two leaders will resolve them in talks later today.
Earlier this week North Korean diplomats told their U.S. counterparts that negotiations should resume, but set no date for new talks.