President Joe Biden on Sunday unveiled several new steps the U.S. is taking to strengthen and streamline supply chains as he convened world leaders at the Group of 20 summits to discuss the bottlenecks hampering the global economy as it recovers from the coronavirus pandemic.President Joe Biden on Sunday unveiled several new steps the U.S. is taking to strengthen and streamline supply chains as he convened world leaders at the Group of 20 summits to discuss the bottlenecks hampering the global economy as it recovers from the coronavirus pandemic.