As the Biden administration increasingly clashes with Israeli leaders over the war in Gaza, a question that often arises is whether U.S. officials will try to exercise some form of harder leverage as Israel ignores their pleas.They could do so, critics say, to try to get Israel to let more humanitarian aid into Gaza as it teeters on the brink of famine, to scale back its military campaign or to refrain from invading the Gaza Strip city of Rafah, where many civilians have fled.Since the Hamas terrorist attacks on Oct. 7, in which about 1,200 Israelis were killed and about 240 taken hostage,…