1. President Trump said that the U.S. military was “cocked and loaded” for a strike against Iran but that he called it off when told, with just minutes to spare, that 150 people would probably die.

In a series of tweets on Friday morning, Mr. Trump said the military action was 10 minutes out when he decided the death toll would not be “proportionate to shooting down an unmanned drone.”

It was unclear why Mr. Trump, pictured at the White House on Thursday, would have received this information so late in the process, something that is typically discussed early in the deliberations between a president and national security officials. Here’s what we know about the escalation overnight.