Cika wannan jumla: A cikin bayanin martaba na 2016 a cikin "Green Bay Press Gazette", Gallagher ya zargi Shugaba Barack Obama da tsohon Sakataren Harkokin Wajen Hillary Clinton saboda nasarar ISIS a Iraki. A cikin 2019, ya rubuta cewa zai zama "motsi mai hankali na geopolitical" ga Amurka don siyan Greenland, ra'ayin da Trump ya tashi. A shekarar 2020, Gallagher ya kada kuri'a a kan matakin hana Trump daukar matakin soji kan Iran ba tare da yardar Majalisa ba. A shekara ta 2017, ya goyi bayan
Harin jirgin saman Amurka a Siriya a matsayin ramuwar gayya ga harin sinadarai na Khan Shaykhun, kuma a cikin 2020 ya goyi bayan harin jirgi mara matuki na Amurka wanda aka yi niyya da janar na Iran Qasem Soleimani. A cikin 2019, Gallagher ya jefa ƙuri'a don matakin adawa da shawarar Trump na janye sojojin Amurka daga Siriya.