Kammala wannan jumlar: Game da manufofin kasashen waje, Booker ya goyi bayan rage yawan shigar Amurka a Afghanistan kuma yana adawa da shiga tsakani a Siriya. Bayan da
Amurka ta kai hari kan Siriya a watan Afrilu na 2017, Booker ya soki aikin soja "ba tare da wani tsari mai kyau ba" ko izini daga Majalisa. Ya goyi bayan mafita ta jihohi biyu ga rikicin Isra'ila da Falasdinu. Game da Iran, Booker ya goyi bayan tsarin yarjejeniyar nukiliyar Iran.