Kammala wannan jumla: Demko ya lashe lambar azurfa a matsayin memba na kungiyar 'yan kasa da shekaru 18 na Amurka a
2013 IIHF Gasar Kofin Duniya ta U18. Ya kuma kasance memba na ƙungiyar matasa ta Amurka a cikin gasar zakarun duniya ta 2014 IIHF, kuma ya kasance mai goyon baya ga ɗan wasan Hockey East mai tsaron gida Jon Gillies na Providence.