During his time in Plymouth, Hughes also competed internationally as he skated for Team USA at the World Under-17 Hockey Challenge, IIHF U18 World Championship twice, IIHF World Junior Championship (under 20) and IIHF Men's World Championship.
He played in each of the latter three tournaments this past season, beginning with earning a silver medal at the World Juniors in December and January. Not only was he the youngest player on the under-20 team, but Hughes was also ranked eighth among all tournament skaters with four assists in four games.
In April, he accompanied 20 of his NTDP teammates at the U18 World Championship in Sweden and finished with a tournament-high 20 points (nine goals, 11 assists) and a bronze medal after the Americans defeated Canada in the third-place game. Hughes set a tournament record with 32 points (14 goals, 18 assists) in 14 games over the course of two years at the event (2018, 2019).
A month later, Hughes spent his 18th birthday playing with the men of Team USA at the IIHF World Championship in Slovakia. He even made history by becoming the youngest U.S. player ever at the event. Averaging 13:52 of ice time, Hughes tallied three assists in seven contests.
USA Hockey assistant executive director of hockey operations and former NHL goalie John Vanbiesbrouck said Hughes is one of the most courageous players he's ever seen.
"The way he can create speed through the neutral zone, enter the zone at top speed and make decisions at that speed... I don't want to get into player comparisons, but he has a unique ability to weave and see things that few can," Vanbiesbrouck said to NHL.com. "I've seen him take the puck in between big players and get to the front of the net; he's not afraid."
When asked about potentially becoming the No. 1 pick in the upcoming draft, Hughes told NHL.com that "it'd be a dream come true. I want to be the first player chosen and be the best player in the draft. I feel like I'm in a good position. I think every kid that's draft eligible and whoever thought about the draft, wants to go as high as he can and wants to be the No. 1 kid chosen."