Trump notified them. Probably didn’t give them a whole lot of time to think about leaking it. And The Conservative Treehouse also reported that Trump notified Congress.
From one key Cong who was made aware of it:
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“Congresswoman Kay Granger (TX-12), Chairwoman of the House Appropriations Subcommittee on Defense, released the following statement:
Tonight, the White House made me aware that the United States would no longer stand idly by as President Assad slaughters his own people. I cannot more strongly applaud President Trump’s decisive actions against the Government of Syria. For years we have watched as the Syrian people endured unimaginable atrocities at the hand of their own government. The world cannot allow this type of evil to go unchecked. Tonight the United States has shown we are ready to lead the fight.”
That’s my point. He didn’t give them months or weeks or days. They had what an hour or two warning? Not quite enough time for the bad guys turn the base into hospitals and nursery schools and or remove all their assets etc.