Robert Costa:

At a National Security Council meeting on Jan. 19, Trump disregarded the significance of the massive U.S. military presence on the Korean Peninsula, including a special intelligence operation that allows the United States to detect a North Korean missile launch in seven seconds vs. 15 minutes from Alaska, according to Woodward. Trump questioned why the government was spending resources in the region at all.

“We’re doing this in order to prevent World War III,” Defense Secretary Jim Mattis told him.

After Trump left the meeting, Woodward recounts, “Mattis was particularly exasperated and alarmed, telling close associates that the president acted like — and had the understanding of — ‘a fifth- or sixth-grader.’ ”

In Woodward’s telling, many top advisers were repeatedly unnerved by Trump’s actions and expressed dim views of him. “Secretaries of defense don’t always get to choose the president they work for,” Mattis told friends at one point, prompting laughter as he explained Trump’s tendency to go off on tangents about subjects such as immigration and the news media.

Inside the White House, Woodward portrays an unsteady executive detached from the conventions of governing and prone to snapping at high-ranking staff members, whom he unsettled and belittled on a daily basis.

Be sure to listen to the recording of the phone call Woodward made to the president, in which he detailed his troubles reaching the president for comment despite months of trying.