He will effectively increase his percentage of Jewish votes. But they aren't the real target of his statement. It's Evangelicals, and anyone else remotely interested in American national security. It's a lot of people. I think there's a magnum's worth of powder in that buck. What I like best is that what he's suggesting is the right thing to do.
I doubt the target was evangelicals. He was speaking to a Jewish group. Most likely, he just wants their funding.