NATO Secretary-General Jens Stoltenberg said after hosting allied leaders on Thursday that U.S. President Donald Trump was clear on his commitment to defending Europe and also "blunt" on demands for more defense spending by allies.

"Trump has been clear on his commitment to NATO. But President Trump has also been clear in the message to all allies that we have to deliver on the pledge we made to increase defense spending," Stoltenberg said, according to Reuters.