The black S.U.V. carrying Prime Minister Benjamin Netanyahu arrived at the White House just before 11 a.m. on Feb. 11. The Israeli leader, who had been pressing for months for the United States to agree to a major assault on Iran, was whisked inside with little ceremony, out of view of reporters, primed for one of the most high-stakes moments in his long career.

U.S. and Israeli officials gathered first in the Cabinet Room, adjacent to the Oval Office. Then Mr. Netanyahu headed downstairs for the main event: a highly classified presentation on Iran for President Trump and his team in the White House Situation Room, which was rarely used for in-person meetings with foreign leaders.