 Tkachuk was the captain of the gold-winning U.S. under-18 national team at the 2017 IIHF World U18 Championships.Tkachuk was selected to the U.S. under-20 national team for the 2018 World Junior Ice Hockey Championships in Buffalo, New York, winning bronze.Tkachuk was born in Scottsdale, Arizona as his father, Keith was a member of the Phoenix Coyotes at the time of his birth.