Actually I believe that was said by a certain nobleman whose words were related by Jesus in a parable, not Jesus himself.
Christianity for the most part is not about slaying ones enemies nor the enemies of the faith.
Christanity is not, but God Himself is. Justice is coming, but after their measure of wickedness is full.
Then their punishment will be made full, but by God Himself. God is wise enough to give them enough rope to hang themselves. I suspect Obama is going to have an incredible lot to answer for in the end.
Christians need not worry about that, Justice is in God’s hands. We need only to keep our own hands and hearts clean.