Republican presidential candidate, Sen. Ted Cruz, R-Texas, speaks during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill) ** FILE **
Republican presidential candidate, Sen. Marco Rubio, R-Fla., speaks during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill) ** FILE **
Then-Republican presidential candidate Donald Trump, left, and Jeb Bush slap hands near the finish of the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill) ** FILE **
Republican presidential candidate, businesswoman Carly Fiorina, makes a point during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)
Republican presidential candidate, businessman Donald Trump speaks during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)
Republican presidential candidate, businesswoman Carly Fiorina speaks during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif. (AP Photo/Mark J. Terrill)
The audience prepares for the start of the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday in Simi Valley, Calif. (Associated Press)
**FILE** Liz Cheney poses questions to her father, former Vice President Dick Cheney, while discussing his newly published book, “In My Time: A Personal and Political Memoir," which was co-authored by Ms. Cheney, at the Ronald Reagan Presidential Library and Museum in Simi Valley, Calif., on Sept. 20, 2011. (Associated Press)
** FILE ** In this Aug. 23, 2011, file photo, Sen. Marco Rubio, R-Fla., speaks at the Ronald Reagan Presidential Library in Simi Valley, Calif. (AP Photo/Jae C. Hong, File)
** FILE ** Republican presidential candidate Texas Gov. Rick Perry answers a question as Republican presidential candidate former Massachusetts Gov. Mitt Romney listens during a Republican presidential candidate debate at the Reagan Library Wednesday, Sept. 7, 2011, in Simi Valley, Calif. (AP Photo/Jae C. Hong)
New Jersey Gov. Chris Christie indirectly attacked Texas Gov. Rick Perry, a candidate for the Republican presidential nomination, on immigration in a speech Tuesday at the Ronald Reagan Presidential Library in California. Mr. Christie has said he isn't a candidate for president in 2012. (Associated Press)
New Jersey Gov. Chris Christie speaks during the Perspectives on Leadership Forum at the Ronald Reagan Presidential Library in Simi Valley, Calif.,Tuesday, Sept. 27, 2011. (AP Photo/Jae C. Hong)