WASHINGTON — U.S. policymakers hoping to power an electric vehicle boom acknowledge the country lacks a robust and reliable supply chain for the minerals needed to power next-generation cars. That reality — exposed by the economic aftershocks delivered by the COVID-19 pandemic — looms as a national security risk the administration plans to remedy, in part, by working with like-minded nations. Increasingly, Canada appears to be among the first in line. The White House is signaling plans to increase collaboration between the U.S. and Canada on critical minerals, according to a recent supply chai...