President Donald Trump will address around 800 US and Israeli dignitaries at the ceremonial opening of the American embassy in Jerusalem by video on Monday, the US ambassador said.
It was not immediately clear from Ambassador David Friedman's comment, on a call with reporters, whether Trump would speak via a live videolink or a pre-recorded address.
"Big week next week when the American Embassy in Israel will be moved to Jerusalem. Congratulations to all!" Trump tweeted on Friday.
The ambassador said staff at the Tel Aviv mission had just marked its last day as an embassy and some of them would turn up for work on Monday at the Jerusalem embassy, which would host an opening ceremony later that day.
"People will be coming back to work as the embassy branch of the Jerusalem embassy, and I think we're all very happy and excited to be participating in such a historic event," Friedman said.
"People have been working literally around the clock in getting ready for our opening dedication ceremony on Monday. We'll be ready."
Lindsey Graham's office said he would be among a delegation of senators, also including Ted Cruz, who would attend the opening ceremony and meet with Israeli officials about "counter-terrorism and national security issues."