The move deepened the idea that a Vietnam-era law, which says congressionally unauthorized deployments into “hostilities” must end after 60 days, does not apply to airstrike campaigns.

The Republican chairman and senior Democrat on the Armed Services Committee said on Friday that the Pentagon had not handed over information about the attacks despite repeated requests.

The attacks, which have left at least 61 people dead, are threatening the region’s fishing, shipping and tourism industries ...