AdvertisementBiden Says Russia's Putin Is A 'Worthy Adversary' Whether Or Not He Trusts HimJune 14, 2021Ayesha RascoefacebookEmailPresident Biden touches a piece of steel from the World Trade Center at a memorial to the 9/11 attacks Monday at NATO headquarters in Brussels. NATO allies joined in a collective defense with the U.S. after the terror attacks. (AP)