CAIRO/GAZA CITY — Israel’s assassination of a senior Hamas commander threatens the viability of the Gaza ceasefire, the chief negotiator of the militant group said on Sunday, calling on President Donald Trump to demand Israel comply with the terms of the truce.

Thousands of Hamas supporters rallied in central Gaza City at a funeral for senior commander Raed Saed and three associates killed alongside him on Saturday.

The mourners chanted “Martyrs are dear to God” and carried the bodies in coffins draped in green Hamas flags, in one of the group’s biggest displays of its presence since a U.S.-backed ceasefire deal came into effect in Gaza in October.

In a televised address, Hamas chief negotiator Khalil al-Hayya, who lives in exile, confirmed the killing of Saed, the highest-profile assas

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