Could a single tweet spark a nuclear war? U.S. President Donald Trump may have narrowly avoided such a scenario had he sent out a missive he drafted that North Korea would have seen as a sign of an imminent attack, Watergate journalist Bob Woodward said in an interview Sunday.

Woodward, whose new book "Fear: Trump in the White House" will hit bookstore shelves Tuesday, told CBS that, amid a monthslong standoff with Pyongyang, the most dangerous moment came when the president went to work on a tweet about removing families of U.S. troops stationed in South Korea.

"He drafts a tweet saying 'We are going to pull out dependents from South Korea. ... Family members of the 28,000 people there,' " Woodward said on "CBS Sunday Morning."