On January 5, 2024, McGlynn was received his first call-up to the [[United States men's national soccer team|senior national team]] for January training in Orlando ahead of a friendly against [[Slovenia national football team|Slovenia]].<ref>{{Cite web |title=TWENTY-FIVE PLAYERS CALLED FOR USMNT JANUARY TRAINING CAMP IN ORLANDO AHEAD OF USA-SLOVENIA ON JAN. 20 |url=https://www.ussoccer.com/stories/2024/01/twenty-five-players-called-for-usmnt-january-training-camp-orlando-ahead-of-usa-slovenia-on-jan-20 |date=January 5, 2024 |access-date=January 11, 2024 |website=[[United States Soccer Federation]]}}</ref> On January 20, McGlynn came on as a substitute in the 61st minute in their 0–1 loss to Slovenia.<ref>{{Cite news |date=January 20, 2024 |title=U.S. MEN’S NATIONAL TEAM FALLS 1-0 TO SLOVENIA AS 11 PLAYERS MAKE INTERNATIONAL DEBUT |url=https://www.ussoccer.com/stories/2024/01/usmnt-vs-slovenia-highlights-match-recap-final-score-stats-1-20-24 |access-date=January 27, 2024 |work=[[U.S. Soccer]]}}</ref>