“They don’t have control of their own country,” Mr. Esper recounts Mr. Trump saying.

When Mr. Esper raised various objections, Mr. Trump said that “we could just shoot some Patriot missiles and take out the labs, quietly,” adding that “no one would know it was us.” Mr. Trump said he would just say that the United States had not conducted the strike, Mr. Esper recounts, writing that he would have thought it was a joke had he not been staring Mr. Trump in the face…

Mr. Esper singles out officials whom he considered erratic or dangerous influences on Mr. Trump, with the policy adviser Stephen Miller near the top of the list. He recounts that Mr. Miller proposed sending 250,000 troops to the southern border, claiming that a large caravan of migrants was en route. “The U.S. armed forces don’t have 250,000 troops to send to the border for such nonsense,” Mr. Esper writes that he responded.

In October 2019, after members of the national security team assembled in the Situation Room to watch a feed of the raid that killed the Islamic State leader Abu Bakr al-Baghdadi, Mr. Miller proposed securing Mr. al-Baghdadi’s head, dipping it in pig’s blood and parading it around to warn other terrorists, Mr. Esper writes. That would be a “war crime,” Mr. Esper shot back.