You can bet the WH is trying different words for their affect tonight. Unless he says he is stopping the Syrian invasion it is all empty rhetoric.
But Obama will not be able to stop himself from linking gun control to the fight against terrorism. He may announce that no one on the "No fly" list will be allowed to buy a gun. He will talk about revisions to the Visa Wavier Program to better screen those who come here without the need for a visa. He will accuse Congress for not giving him what he needs. He will conflate domestic terrorism (Planned Parenthood and Charleston) with ISIS. And finally, he will defend Islam and the refugee program.
I have no doubt he will use FDR's We have nothing to fear, but fear itself. Probably as the last sentence prior to God Bless America.
Tonight, Obama will wrap himself tightly in the American flag showing some phony outrage and anger. Patriotism is the last refuge of a scoundrel.