If President Trump does this correctly by giving a nationally televised speech explaining that by attacking an embassy, it is the same as attacking the nation, he will get the support of the citizens. If he asks Congress to declare war, Congress will fold because the American citizens will want action against a nation that has been a thorn in our side since 1978. Sink all their shipping, blockade their ports, freeze their accounts, drone their leaders, and at the end send in troops to mop up.
That’s a nice thought (television address) but picture it...the MSM talking over PT, ‘fact checking,’ etc.