Secretary of State Antony Blinken said Tuesday that the emergence of the omicron coronavirus variant demonstrates the need to vaccinate the global population in order to get past the pandemic. “We know that none of us will be fully safe until everyone is,” Blinken told reporters in Latvia. “And we've been saying that as long as the virus is replicating somewhere, it could be mutating, and if it's mutating, we might wind up with a variant that poses a new threat and that can defeat the existing vaccines or induce greater illness or be more transmissible, all the questions we're...