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WATCH: Trump says he hopes North Korea meeting is successful, but will ‘respectfully leave’ or cancel if it’s not

President Donald Trump says the United States will be doing “everything possible” to make an upcoming meeting with North Korean leader Kim Jong Un a “worldwide success.”

Trump says the U.S. is “fighting very diligently” to win freedom for three Americans detained in North Korea. He added that he thinks there’s a “good chance of doing it” and that “we’re having a good dialogue” with the North Koreans. He did not answer directly when asked if he intends to sit down with North Korean leader Kim Jung Un at their proposed summit if the Americans are still being detained.

Trump says he hopes to have a successful meeting with Kim, but he’ll cancel if he doesn’t think it will be successful.

READ MORE: What to expect from Trump’s visit with Japanese Prime Minister Abe

The president also says he will “respectfully leave” the meeting after it starts if he feels it won’t be fruitful.

The president said at a joint news conference with Japanese Prime Minister Shinzo Abe in Florida on Wednesday that he hopes to see the day when the two Koreas can live together in “safety, prosperity and peace.”

He says Japan is “a lot closer” to North Kore but adds, “We’re working on this together.”

Trump recently sent CIA Director Mike Pompeo to meet with the North Korean leader. Pompeo is also Trump’s nominee for secretary of state.

The president has said his own meeting with Kim could take place by early June.