In comments ahead of U.S. President Donald Trump's planned second meeting with North Korean leader Kim Jong Un, Trump said Sunday that crippling sanctions imposed on nuclear-armed North Korea will remain "in full force and effect" until the United States sees "very positive" results.

Trump said that discussions on the location of the next summit are underway and that further details will be announced soon.

"We are negotiating a location," he said, according to the televised remarks.