WASHINGTON (REUTERS) - US President Donald Trump declined to say on Wednesday (Oct 25) whether he will visit the Korean Peninsula's demilitarised zone during an upcoming Asia tour.

"I'd rather not say, but you'll be surprised," Trump told reporters on the White House South Lawn as he prepared to depart on a trip to Dallas.

Trump is scheduled to depart on Nov 3 on a trip that includes visits to Japan, South Korea, China, Vietnam and the Philippines. His trip is expected to be heavily dominated by the nuclear and ballistic missile threat that North Korea poses.

The DMZ is a border barrier between South and North Korea and is a traditional stop for American dignitaries.

White House officials say Trump is to visit South Korea's Camp Humphreys during his visit to South Korea to hail the US-South Korean alliance.

There are no concerns about what message Trump would send by not going to the DMZ, a senior White House official told reporters on Monday.

"The message is that we are guests during a state visit of President Moon Jae-in, who's invited us to make a visit to Camp Humphreys. So we'll keep talking with the South Korean government to see if there are things that they want to adjust,"the official said.