In July 2017 Spadaro co-wrote, a controversial article entitled "Evangelical Fundamentalism and Catholic Integralism" in which he and Argentine Presbyterian Marcelo Figueroa made political statements attacking the supporters of United States presidentDonald Trump. The article was approved by the Cardinal Secretary of StatePietro Parolin and published in the Jesuit journal La Civiltà Cattolica. Sparado and Figueroa described American political life as Manichaean and said the Trump administration was responsible for promoting an "apocalyptic geopolitics", comparing American conservative Christians to ISIS. Spadaro took aim at American Catholics who supported the conservative movement and Trump in particular. Spadaro published an article in which he criticized Trump advisor Steve Bannon for his ideological ties to Calvinist theologian Rousas John Rushdoony in spite of his Catholic faith. He also singled out Church Militant for "shocking rhetoric." Spadaro said that American Catholics and Protestants both promoted an "ecumenism of conflict" over abortion, same-sex marriage, and religious education in schools that also included a "xenophobic and Islamophobic vision", transforming it into an intolerant "ecumenism of hate." The article also criticized conservatives for being uncritical of militarism, capitalism and the arms industry and for disregarding the environment. While praised by liberal publications such as the National Catholic Reporter and Commonweal, P.J. Smith wrote in First Things, "Indeed, the liberal atomization that Spadaro and Figueroa want to exalt is one of the central problems with modernity that Francis dissects brilliantly in Laudato si'. Francis teaches us in that encyclical that 'it cannot be emphasized enough how everything is interconnected.'" The Archbishop of Philadelphia, Charles J. Chaput, described the article as "an exercise in dumbing down" and accused Spadaro and Figueroa of being "willfully ignorant" of the battle faced by American Catholics and Evangelical Protestants. Chaput said, "It's an especially odd kind of surprise when believers are attacked by their co-religionists merely for fighting for what their Churches have always held to be true."
