Privately, the president had often talked about fortifying a border wall with a water-filled trench, stocked with snakes or alligators

https://www.nytimes.com/2019/10/01/us/politics/trump-border-wars.html

The Oval Office meeting this past March began, as so many had, with President Trump fuming about migrants. But this time he had a solution. As White House advisers listened astonished, he ordered them to shut down the entire 2,000-mile border with Mexico — by noon the next day.

The advisers feared the president’s edict would trap American tourists in Mexico, strand children at schools on both sides of the border and create an economic meltdown in two countries. Yet they also knew how much the president’s zeal to stop immigration had sent him lurching for solutions, one more extreme than the next.

Privately, the president had often talked about fortifying a border wall with a water-filled trench, stocked with snakes or alligators, prompting aides to seek a cost estimate. He wanted the wall electrified, with spikes on top that could pierce human flesh. After publicly suggesting that soldiers shoot migrants if they threw rocks, the president backed off when his staff told him that was illegal. But later in a meeting, aides recalled, he suggested that they shoot migrants in the legs to slow them down. That’s not allowed either, they told him.

“The president was frustrated and I think he took that moment to hit the reset button,” said Thomas D. Homan, who had served as Mr. Trump’s acting director of Immigration and Customs Enforcement, recalling that week in March. “The president wanted it to be fixed quickly.”

Mr. Trump’s order to close the border was a decision point that touched off a frenzied week of presidential rages, round-the-clock staff panic and far more White House turmoil than was known at the time. By the end of the week, the seat-of-the-pants president had backed off his threat but had retaliated with the beginning of a purge of the aides who had tried to contain him.

Today, as Mr. Trump is surrounded by advisers less willing to stand up to him, his threat to seal off the country from a flood of immigrants remains active. “I have absolute power to shut down the border,” he said in an interview this summer with The New York Times.

This article is based on interviews with more than a dozen White House and administration officials directly involved in the events of that week in March. They were granted anonymity to describe sensitive conversations with the president and top officials in the government.

In the Oval Office that March afternoon, a 30-minute meeting extended to more than two hours as Mr. Trump’s team tried desperately to placate him.

“You are making me look like an idiot!” Mr. Trump shouted, adding in a profanity, as multiple officials in the room described it. “I ran on this. It’s my issue.”