U.S. President Donald Trump on Monday asked the Senate to ratify the treaty protocol confirming Macedonia as the 30th member state of the North Atlantic Treaty Organization (NATO).

“I transmit herewith, for the advice and consent of the Senate to its ratification, the Protocol to the North Atlantic Treaty on the Accession of the Republic of North Macedonia,” Trump wrote in a letter to the Senate, according to the White House.

Trump noted in the letter that the country is a security partner of the United States, and its NATO membership will directly benefit U.S. strategic interests and the NATO Alliance.

“I ask that the Senate provide its advice and consent,” Trump wrote at the end of the letter.

The accession protocol was signed by all member states in Brussels on Feb. 6. The process has since moved to the capitals of all Allies, where the protocol will be ratified according to the national procedures of the member states.