Hagge is a "friend of Israel" because he beleives that Israel has a role to play in the End-times. He wants all Jews in Israel to convert to Christianity so the Second Coming can happen. The unconverted Jews will be left behind to face the apocolypse. You can't accept Jesus as your saviour and still be Jewish. Therefore he wants Isrel to be a state with no Jews in it.
Israeli troops shoot, injure Palestinian crossing Gaza border fence (Haaretz)
from the article: Top Republican candidate says supports dialogue with Iran