TEL AVIV, Israel (AP) — Prime Minister Benjamin Netanyahu rebuked a top Cabinet minister heading to Washington on Sunday for talks with U.S. officials, according to an Israeli official, signaling widening cracks within the country’s leadership nearly five months into its war with Hamas.

The trip by Benny Gantz, a centrist political rival who joined Netanyahu’s wartime Cabinet following Hamas’ Oct. 7 attack, comes as friction between the U.S. and Netanyahu is also rising over how to alleviate the suffering of Palestinians in Gaza and what the postwar plan for the enclave should look like.

An official from Netanyahu’s far-right Likud party said Gantz’s trip was planned without authorization from the Israeli leader. The official, who spoke on condition of anonymity, said Netanyahu had a “tough talk” with Gantz and told him the country has “just one prime minister.”

Gantz is scheduled to meet on Monday with U.S. Vice President Kamala Harris and national security adviser Jake Sullivan, according to his National Unity Party. A second Israeli official speaking on condition of anonymity said Gantz’s visit is intended to strengthen ties with the U.S., bolster support for Israel’s war and push for the release of Israeli hostages.