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Sen. Marco Rubio (R-FL) (left) confers with Sen. John McCain (R-AZ) (right) as U.S. Ambassador to Syria Robert Ford testifies before the Senate Foreign Relations Committee October 31, 2013 in Washington, D.C.
Sen. Marco Rubio (R-FL) (left) confers with Sen. John McCain (R-AZ) (right) as U.S. Ambassador to Syria Robert Ford testifies before the Senate Foreign Relations Committee October 31, 2013 in Washington, D.C.

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    Rubio, McCain test Trump's down ballot impact

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Rubio, McCain test Trump's down ballot impact

Marco Rubio and John McCain are facing primary senate battles against Donald Trump supporters. CNN's Manu Raju reports.

Rubio, McCain test Trump's down ballot impact

Marco Rubio and John McCain are facing primary senate battles against Donald Trump supporters. CNN's Manu Raju reports.