US Secretary of State Antony Blinken left empty-handed after a tour of the Middle East aimed at reaching a ceasefire in Israel’s offensive on Gaza, AFP reports.

Blinken appealed to Hamas to urgently accept a US-backed truce proposal, while also entering into a public spat with Israel over its future presence in the besieged Palestinian territory.

“Time is of the essence,” Blinken said before flying out of Doha after stops in Qatar, Egypt and Israel on his ninth regional tour seeking to halt the Gaza conflict.

“This needs to get done, and it needs to get done in the days ahead, and we will do everything possible to get it across the finish line,” he said of the truce proposal.

A day after Blinken said US ally Israel was on board, Prime Minister Benjamin Netanyahu was quoted by Israeli media as disagreeing on a key sticking point.

Netanyahu insisted Israel maintain control of the Philadelphi Corridor, the border between Gaza and Egypt that Israeli forces seized from Hamas, whom Israel says relies on secret tunnels to bring in weapons.