Drug overdose deaths plummeted over 20% as border enforcement tightened, new CDC data shows. Experts suggest stronger policies may curb fentanyl flow.

President Donald Trump's new drug czar Sara Carter visited the U.S.-Mexico border this week. There, she vowed to seal the southern border against illicit activity such as drug and human trafficking and to push cartels out of the United States.

Trump has renewed his criticism of Nato, questioning whether the alliance would come to America’s defence and suggesting it should be “put to the test” by deploying forces to the US–Mexico border.

Separately, Trump sparked outcry in the United Kingdom after saying in a Fox Business interview that NATO troops "stayed a little off the front lines" in Afghanistan.

From border wall construction to mass deportations, here's a look at the president's campaign promises and their implementation.