Here are highlights on the schedule for President Donald Trump's first overseas trip in office. His destinations: Saudi Arabia, Israel and the Palestinian territories, the Vatican, Italy and Belgium.

Trump will visit the homelands of three major religions -- which no president has done in the same trip before, a senior administration official said Wednesday -- and attend multiple high-profile summits.

Secretary of State Rex Tillerson will accompany Trump for most of the itinerary, National Security Adviser H.R. McMaster said Tuesday. First lady Melania Trump will travel with him on at least part of the trip, the senior administration official said.

FRIDAY, MAY 19: TRUMP LEAVES

Trump departs. He's said his pick to replace James Comey as FBI director could be announced before he leaves.

SATURDAY, MAY 20: TRUMP MEETS SAUDI ARABIA'S KING

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Trump will meet Saudi Arabia's King Salman for the first time, in Saudi Arabia, for bilateral talks. They are aimed at repairing relations that were strained under the Obama administration.

SUNDAY, MAY 21: TRUMP ATTENDS SUMMIT IN SAUDI ARABIA

The president is scheduled to meet with the six-nation Gulf Cooperation Council, which is led by Saudi Arabia.

That afternoon, Trump will attend a summit with heads of state from Muslim-majority nations, convened by Saudi Arabia. The Saudi king hopes the meeting "will establish a new partnership in confronting extremism and terrorism." Trump's speech will address "the need to confront radical ideology" and his hopes for a peaceful vision of Islam in the world, McMaster said in a trip preview.

“He’ll talk about what unites us in uplifting terms, but he’ll also be very blunt in talking about the need to confront extremism and the fact that many in the Muslim world have not only not done enough, they’ve actively abetted this extremism," the senior administration official said. "Even as some of them have talked a good game on the surface, but in quiet, continued to fund extremism.”

McMaster said Trump will also take part "in the inauguration of a new center intended to fight radicalism and promote moderation."

MONDAY, MAY 22-TUESDAY, MAY 23: TRUMP IN ISRAEL, PALESTINIAN TERRITORIES

The president will visit Israel and the Palestinian territories, meeting separately with Israeli Prime Minister Benjamin Netanyahu and Palestinian Authority President Mahmoud Abbas, officials say. Don't expect a major announcement about Israeli-Palestinian peace talks. "This is still about relationship-building and taking this effort to the next level," the senior administration official said.

"He’s taking a different approach," the official said of Trump. "He sees himself as more of a convener and a facilitator and a go-between and not as somebody who’s going to dictate terms.”

Trump's plans include a prayer at the Western Wall in Jerusalem's Old City. A diplomatic spat emerged after an American official reportedly told the Israelis the site is "not your territory."

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WEDNESDAY, MAY 24: POPE FRANCIS AND TRUMP AT VATICAN

Trump will have an audience with Pope Francis at the Vatican. The pope has said that anyone who wants to build walls to keep out migrants is "not Christian"; Trump said it was "disgraceful" that the pope would question his faith. Francis says he will listen respectfully to the president and won't try to soften his policies, but will seek common ground.

THURSDAY, MAY 25: TRUMP'S FIRST NATO SUMMIT

Trump will meet with the presidents of the European Union and the European Council at the EU's headquarters in Brussels, McMaster said. A working lunch will follow with new French President Emmanuel Macron.

As a candidate Trump called NATO "obsolete," but has since changed his mind; on Thursday he'll attend his first NATO summit in Brussels. That afternoon he will speak at the unveiling of a NATO memorial, where he "will reaffirm America's commitment to the alliance" and repeat his theme that all of its members must share responsibility and burdens, McMaster said. Also on the agenda: the NATO leaders' meeting and dinner, with Defense Secretary Jim Mattis.

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FRIDAY, MAY 26-SATURDAY MAY 27: TRUMP'S FIRST G-7 SUMMIT

Trump will close out the trip with the G-7 summit in Taormina, Sicily, in Italy. Before heading home, he will thank American and allied servicemen and servicewomen and their families, McMaster said.