Department of State spokeswoman Heather Nauert said on Thursday that that U.S. "reserves the right to respond" after Russia announced a retaliatory expulsion of U.S. diplomats. Nauert said Russia has decided to "further isolate itself diplomatically and economically." While the U.S. wasn't surprised by Russia kicking out 60 U.S. diplomats, it's "unjustified" she said, adding that Russia "should not be acting like a victim."