Israel says it wants to destroy Hamas. But who would govern Gaza after that?

Biden administration officials and lawmakers support Israel’s plans to strike hard at Hamas but they worry their ally has no clear plan for who will govern Gaza if and when the militants are driven out, according to sources familiar with the matter, members of Congress and former U.S. officials.

Israel has vowed to “destroy” Hamas, an organization that has been entrenched in Gaza for decades and in power since 2006, but the Israeli government has yet to outline what it envisions for the densely populated enclave after the military operation ends.

Israel does not appear to have...