If America got hit with a nuclear weapon by a foreign country - would they react with a nuclear weapon or?

Under the current administration I think we could be in for some troubles. I fear that he would probably decide that 'negotiation' would be the way to go. And I'm not convinced that negotiating with some entity that wants to kill as many Americans as they can with a nuke is someone we want to negotiate with. It would be a sign of weakness. Such people unfortunately only understand one thing. They think we are weak as it is and every day obama gives them more to bolster that impression. No I don't think he would respond with a nuke. You have a good day now