Kammala jumla mai zuwa: Bayan zaben Donald Trump, fifikon Amurka game da Assad ya bambanta da fifikon gwamnatin Obama, kuma a watan Maris na 2017 Jakadan Amurka a Majalisar Dinkin Duniya Nikki Haley ya bayyana cewa Amurka ba ta mai da hankali kan "fitar da Assad", amma wannan matsayin ya canza bayan harin sinadarin Khan Shaykhun na 2017. Bayan da
harin makamai masu linzami a kan wani sansanin jiragen sama na Siriya bisa umarnin Shugaba Trump, kakakin Assad ya bayyana halayyar Amurka a matsayin "rashin adalci da girman kai" kuma ya bayyana cewa hare-haren makamai masu linzami "ba sa canza manyan manufofi" na gwamnatin Siriya. Shugaba Assad ya kuma gaya wa kamfanin dillancin labarai na Faransa cewa sojojin Siriya sun watsar da dukkan makaman sunadarai a shekarar 2013, kuma ba za su yi amfani da su ba idan har yanzu suna riƙe da su, kuma sun bayyana cewa harin sunadarai "100 bisa dari ne" wanda aka yi amfani da shi don tabbatar da harin jirgin saman Amurka. A watan Yunin 2017, Shugaban Rasha Putin ya ce "Assad bai yi amfani da [makamai masu guba] ba" kuma cewa harin sunadarai "mutane ne da suke so su zarge shi da hakan". Majalisar Dinkin Duniya da masu binciken makamai masu guba na kasa da kasa sun gano cewa harin aikin gwamnatin Assad ne.