As Israel begins its necessary war against Hamas, the U.S. must do all it can diplomatically and with military and intelligence support to ensure it succeeds. Unfortunately, although President Joe Biden has offered clear rhetorical support for Israel since the weekend and condemned Hamas's multipronged atrocities, his record dealing with the world's worst terrorist regime, Iran, has been weak, dishonest, and shameful. Iran is Hamas's sponsor in weapons, financing, and other support. Hamas is essentially a terrorist arm of the Tehran regime more than it is a representative of the Palestinian people. If Biden is as serious about supporting Israel...