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Sen. Mike Lee, R-Utah. (AP Photo/J. Scott Applewhite) Marco Rubio makes a point during the CNN Republican presidential debate at the Venetian Hotel & Casino on Tuesday, Dec. 15, 20 Republican presidential candidate, Sen. Marco Rubio, R-Fla., right, accompanied by Sen. Mike Lee, R-Utah, discuss their recently r Ted Cruz takes the stage during the CNN Republican presidential debate at the Venetian Hotel & Casino on Tuesday, Dec. 15, 201 Ted Cruz stands with daughter Caroline following the CNN Republican presidential debate at the Venetian Hotel & Casino on Tues Sen. Marco Rubio, R-Fla., right, accompanied by Sen. Mike Lee, R-Utah, outline their ideas for a new tax plan during a news confer Republican presidential candidate, Sen. Marco Rubio, R-Fla., right, accompanied by Sen. Mike Lee, R-Utah, discuss their recently r