This week on "Face the Nation with Margaret Brennan," Sens. Rand Paul and Tammy Duckworth discuss President-elect Donald Trump's Cabinet picks after a busy week on Capitol Hill. Plus, Rep.-elect Sarah McBride, the first openly transgender person elected to Congress, joins. Ret. Gen. H.R. McMaster, who served as national security adviser in the first Trump administration, tells "Face the Nation with Margaret Brennan" that the longer-range missiles the White House are sending to Ukraine "can make a difference" in the final days of the Biden administration. The result, McMaster said, is the next few months are "really critical" for Ukraine. Democratic Sen. Chris Van Hollen of Maryland, who last week backed Sen. Bernie Sanders' bill to block U.S. sending arms to Israel, told "Face the Nation with Margaret Brennan" that President Biden " is not fully complying with American law" on sending arms to Israel.