This bill establishes the Senate NATO Observer Group within the Senate to address and advise on matters related to the North Atlantic Treaty Organization. Its primary functions include serving as a forum for NATO issues spanning multiple Senate committees and advising the Senate on topics such as NATO enlargement. The group is also tasked with fostering close interactions among the executive branch, the Senate, NATO, member countries, and candidate countries, particularly during enlargement negotiations. For the 119th Congress, the group's structure will follow existing arrangements, while in subsequent Congresses, the majority and minority leaders will each appoint up to seven Senators, including co-chairs. These co-chairs, along with a designated staff member, are authorized to undertake foreign travel for official purposes. The Office of Interparliamentary Services will provide administrative support, and the co-chairs can use foreign currencies for critical activities, with the group required to submit an annual report on its activities to Senate leadership and the Foreign Relations Committee.