President Trump stressed regional unity in calls with several leaders of nations in the Persian Gulf region on Sunday.

Trump "addressed his concerns about the ongoing dispute between Qatar and some of its Gulf and Arab neighbors" during the calls, the White House said.

Trump spoke with King Salman bin Abdulaziz Al Saud of Saudi Arabia, Crown Prince Mohamed bin Zayed Al Nahyan of Abu Dhabi, and Emir Tamim bin Hamad Al Thani of Qatar.

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"He reiterated the importance of stopping terrorist financing and discrediting extremist ideology," according to the White House.

"The President also underscored that unity in the region is critical to accomplishing the Riyadh Summits goals of defeating terrorism and promoting regional stability."

Trump on Monday tweeted that he had spoken with the king of Saudi Arabia and that "interesting things" are happening.

"Spoke yesterday with the King of Saudi Arabia about peace in the Middle-East," Trump tweeted. "Interesting things are happening!"

Spoke yesterday with the King of Saudi Arabia about peace in the Middle-East. Interesting things are happening! — Donald J. Trump (@realDonaldTrump) July 3, 2017

The calls come after a report emerged earlier this month that Qatar will reject a set of demands issued by several other Arab nations.

Qatar also accused Saudi Arabia and other nations of attempting to undermine Qatar's sovereignty, according to the Reuters report.