The issue focused on North Korea's military activities in recent months, which may have caused political tensions between Pyongyang and Washington.

Some US officials think that military activity has further fueled economic sanctions against the regime of Kim Jong Un. But Trump said last week he did not expect North Korea to try to pull out of the nuclear deal with world powers.

In an interview with CNN's Anderson Cooper, Mr. Trump asked if there was any chance that Trump could step back from his policy toward North Korea. "