WASHINGTON — The Biden administration has warned Israel that if the humanitarian situation in Gaza doesn’t improve within the next 30 days, the U.S. may restrict military assistance to Israel.

In a letter Sunday to Israeli Defense Minister Yoav Gallant and Israel’s Minister of Strategic Affairs, Ron Dermer, Secretary of State Antony Blinken and Defense Secretary Lloyd Austin said that the U.S. must continually assess under its own law whether Israel is “directly or indirectly”…