Democratic Sen. Tammy Duckworth of Illinois, a combat veteran of the Iraq War, tells "Face the Nation" that Pete Hegseth, President-elect Donald Trump's pick to lead the Defense Department, is "flat-out wrong" in his assessment that women shouldn't be in combat roles.

"Our military could not go to war without its 223,000 women who serve in uniform,” Duckworth said about his comments that women should not serve in combat.