Ahead of Hanoi summit, Trump's security advisor cancels travel to S. Korea

U.S. President Donald Trump's national security adviser John Bolton has cancelled plans to travel to South Korea ahead of next week's summit in Hanoi aimed at addressing North Korea's nuclear program, Bolton's spokesman Garrett Marquis said on Friday.

Bolton decided to stay in Washington to focus on events unfolding in Venezuela, where the military faces a pivotal decision on whether to allow in convoys of humanitarian aid, Marquis said.

Bolton is still expected to attend the summit itself, he said.