Whakaotihia te rerenga e whai ake nei: I mua i te tiimata o tana tau tuatahi i Purdue, i te Pipiri 18, 2015, i panuitia a Swanigan hei mema o te 12-tangata 2015 USA Basketball Men's U19 World Championship Team mo te
2015 FIBA Under-19 World Championship i toa i te mētara koura i Heraklion, Crete. I te whakauru ki te kapa, i kii a Swanigan, "Ka whakatauhia e au nga whaainga mo au ano. Kua whakatakoto whāinga ahau mō tēnei puna. Ko tētahi o aku whāinga ko te whakauru ki tēnei kapa hei whakamutu i taku mahi kura tuarua". Hei whakarite mo nga keemu, i purei a Swanigan i te Nike Hoop Summit, te McDonald's All American Game, me te Jordan Brand Classic. Kaore a Swanigan i uru ki te Indiana-Kentucky All Star Game kia taea ai e ia te haere ki te puni whakangungu U19. Ko ia tetahi o nga kaitakaro e rima i hoki mai i te kapa U17 toa toa koura. Ko te hoa kapa a Swanigan a Vince Edwards i roto i te rere ki te whakauru ki te roopu, engari i tapahia i te rauna o te 16. I mutu te kapa 7 ki te 0, a ko Swanigan te toharite 6.1 tohu me te 4.4 rebounds ia keemu.