President Donald Trump’s foreign envoy Steve Witkoff said Tuesday that he’s hopeful to have a Gaza ceasefire deal by the end of the week, as negotiators make substantial progress working through remaining issues.

Israeli Prime Minister Benjamin Netanyahu touched down in Washington on Monday to discuss U.S. diplomatic efforts in the Middle East, including Israel-Hamas cease-fire negotiations. The trip’s centerpiece will be an evening meeting with U.S. President Donald Trump at the White House.

The two confronted an array of high-stakes Middle East issues. But first they took a victory lap, including the Israeli leader telling President Trump he had nominated him for a Nobel Peace Prize.