WASHINGTON — Top military officers showed senior members of Congress a video of a Sept. 2 attack on a boat suspected of carrying drugs, including a follow-up strike that has been at the center of a growing debate over the Trump administration’s lethal mission.

Gen. Dan Caine, the chair of the Joint Chiefs of Staff, and Adm. Frank M. Bradley, a top Special Operations commander who oversaw the attack, met with members of Congress to discuss the operation and defend the decision to launch a second strike that killed survivors of the first missile.

The military officers briefed the Republican chairs and senior Democrats on the House and Senate Armed Services and Intelligence Committees, as well as defense appropriators, all behind closed doors.

Lawmakers briefed by Bradley said the admiral

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