President Trump suggested the U.S. should have tested NATO’s commitment by invoking Article 5 in response to the southern border crisis.

“It’s very disrespectful.”

U.S. president’s swipe at NATO troops in Afghanistan mark latest challenge to alliance.

British Prime Minister Keir Starmer has urged U.S. President Donald Trump to apologize for his false assertion that troops from NATO countries — other than Americans — stayed away from the front line during the war in Afghanistan.

President Donald Trump’s comments belittling the role of NATO allies in Afghanistan sparked outrage in Britain, which lost 457 soldiers in the U.S.-led war.

Perspective: Trump's latest NATO broadside outrages America's allies amid lingering doubts over the alliance's future.