BRUSSELS—President Donald Trump affirmed the U.S.’s “very strong” commitment to NATO after the summit descended into chaos Thursday as the secretary-general called an emergency session to address the president’s demands that allies immediately meet the 2% military-spending target set for 2024.
In an impromptu news conference, Mr. Trump declared that it was “unnecessary” for the U.S. to withdraw from the North Atlantic Treaty Organization, after telling allied leaders that morning that if they didn’t immediately meet the 2%...