NATO Secretary General Jens Stoltenberg, left, and British Prime Minister Boris Johnson, right, welcome U.S. President Donald Trump during a NATO leaders meeting at The Grove hotel and resort in Watford, Hertfordshire, England, Wednesday, Dec. 4, 2019. NATO Secretary-General Jens Stoltenberg rejected Wednesday French criticism that the military alliance is suffering from brain death, and insisted that the organization is adapting to modern challenges. (AP Photo/Francisco Seco)