President Donald Trump’s Gaza ceasefire plan is set to enter a new phase within weeks, but crucial pieces of the agreement remain undefined as Israel tightens its military grip on the battered enclave.

DOHA, Qatar (AP) — With the remains of one hostage still in Gaza, the first phase of the U.S.-brokered ceasefire in the war between Israel and Hamas is nearly complete, after a two-month process plagued by delays and finger-pointing.

Aid deliveries into Gaza are falling far short of the amount called for under the U.S.-brokered ceasefire, according to an Associated Press analysis of the Israeli military’s figures as humanitarian groups say the shortfall is severely impacting the strip's 2 million people.

The changes come as pressure mounts for Israel and Hamas to move into the second phase of the ceasefire plan that U.S. President Donald Trump brokered in October. Under the terms of the ceasefire, all living and dead hostages would be released before a second phase focused on Gaza’s postwar governance would be negotiated.

President Donald Trump’s 20-point plan — which was approved by the U.N. Security Council — lays out an ambitious vision for ending Hamas’ rule of Gaza.