When Colombia’s president, Gustavo Petro, refused military planes carrying deportees, infuriating President Trump, he revealed how heated the question of deportations has become.

In his first week back in the Oval Office, Trump has quickly torn up his predecessor’s alliance-driven foreign policy in favor of an even more rambunctious 2.0 version of “America First.” His provocations have raised tensions with key allies on multiple continents — and set up showdowns with other leaders that,