Democrats Raphael Warnock and Jon Ossoff are challenging Republican incumbents Kelly Loeffler and David Perdue.
（Under the Electoral College system.Trumps former national security adviser.
還Police in riot gear were deployed to separate them from counterprotesters who gathered nearby.
國Reporting by Kate Kelland; Editing by Alex RichardsonOur Standards: The Thomson Reuters Trust Principles.
個They are the latest in a series of measures aimed at stepping up pressure on Tehran in the waning days of President Donald Trumps administration.
It would be nearly impossible for faithless electors to hand a last-minute victory to Trump.