President Donald Trump has signed an executive order declaring that any attack on Qatar will be considered a threat to U.S. security.

The order comes after an Israeli airstrike in Doha last month killed five Hamas members and a Qatari security officer. Israel said the strike, its first known operation on Qatari soil, targeted Hamas leaders based in the capital, where the group maintains a political office.

“The United States shall regard any armed attack on the territory, sovereignty, or critical infrastructure of the State of Qatar as a threat to the peace and security of the United States,” the order dated Sept. 29 states.

It adds that “in the event of such an attack, the United States shall take all lawful and appropriate measures — including diplomatic, economic, and, if necessary, military — to defend the interests of the United States and of the State of Qatar and to restore peace and stability.”

The order follows Israeli Prime Minister Benjamin Netanyahu’s visit to the White House on Monday, during which he phoned the Qatari prime minister to apologize for last month’s strike in Doha. 

Netanyahu acknowledged violating Qatari sovereignty and pledged that Israel “will not conduct such an attack again,” according to a White House summary.

Qatar hosts the U.S. Al Udeid Air Base, the largest American military installation in the Middle East and home to thousands of U.S. troops. Under President Biden, the U.S. also designated Qatar a major non-NATO ally.

Qatar welcomed the U.S. announcement, describing it as a reflection of “the strong and longstanding ties between Doha and Washington.”

Qatar added it “remains committed to working with the United States and international partners as a trusted mediator to address shared challenges, advance conflict resolution through diplomatic means, and support sustainable peace in the region.”