1. The Republican debates

2. Donald Trump reacts to a comment from Ben Carson and reaches over to him in the midst of the Republican presidential debate in Las Vegas, Nevada December 15, 2015. REUTERS/Mike Blake

3. Donald Trump speaks during the debate. REUTERS/Mike Blake

4. Donald Trump and Jeb Bush are seen debating on video monitors in the press room. REUTERS/David Becker

5. Ben Carson, Donald Trump and Ted Cruz hold their hands over their hearts for the singing of the national anthem before the start of the debate. REUTERS/Mike Blake

6. Donald Trump, Chris Christie and Carly Fiorina leave the stage at the conclusion of the debate. REUTERS/Mike Blake

7. Donald Trump responds to criticism from Jeb Bush as Ted Cruz looks on. REUTERS/Mike Blake

8. Ted Cruz, Jeb Bush and Donald Trump talk at the end of the debate. REUTERS/Mike Blake

9. Donald Trump and Ted Cruz check their watches during a commercial break as Ben Carson looks on. REUTERS/Mike Blake

10. Donald Trump points at Jeb Bush as they shake hands at the end of the debate. REUTERS/Mike Blake

11. Donald Trump talks with Chris Christie during a commercial break. REUTERS/Mike Blake

12. Donald Trump reaches out to Ted Cruz as they talk during a commercial break. REUTERS/Mike Blake

13. Donald Trump talks with Ben Carson during a commercial break. REUTERS/Mike Blake

14. Donald Trump reaches out to shake hands with Ted Cruz as Jeb Bush looks on. REUTERS/Mike Blake

15. Marco Rubio, Ben Carson, Donald Trump and Jeb Bush walk around the stage during a commercial break. REUTERS/Mike Blake

16. Marco Rubio speaks during the debate. REUTERS/Mike Blake

17. Marco Rubio, Ben Carson, Donald Trump, Ted Cruz and Jeb Bush applaud as they pose together before the start of the debate. REUTERS/David Becker

18. Ted Cruz arrives onstage before the start of the debate. REUTERS/David Becker

19. John Kasich, Carly Fiorina, Marco Rubio, Ben Carson, Donald Trump, Ted Cruz, Jeb Bush, Chris Christie and Rand Paul pose before the start of the debate. REUTERS/Mike Blake

20. Mike Huckabee speaks during a forum for lower polling candidates held before the Republican presidential debate. REUTERS/Mike Blake

21. Rick Santorum speaks as Lindsey Graham listens. REUTERS/Mike Blake

22. George Pataki and Mike Huckabee share a laugh as they talk during a commercial break. REUTERS/Mike Blake

23. Mike Huckabee and Lindsey Graham shake hands during a commercial break as Rick Santorum looks on. REUTERS/Mike Blake

24. Mike Huckabee and Rick Santorum pose together before a forum for lower polling candidates. REUTERS/David Becker

25. George Pataki answers a question from debate moderator and CNN anchor Wolf Blitzer. REUTERS/Mike Blake

26. Lindsey Graham has his tie straightened by a debate staff member during a commercial break. REUTERS/Mike Blake

27. Rick Santorum arrives onstage to participate in a forum for lower polling candidates. REUTERS/David Becker

28. Ayla Brown sings "God Bless America" prior to the start of a forum for lower polling candidates. REUTERS/Mike Blake

29. Rick Santorum answers a question from debate moderator Wolf Blitzer (foreground) as Mike Huckabee and Lindsey Graham look on. REUTERS/Mike Blake

30. CNN's Wolf Blitzer begins to moderate. REUTERS/David Becker

31. General view of the venue as CNN's Wolf Blitzer moderates. REUTERS/Mike Blake

32. Ben Carson is interviewed prior to the Republican Presidential Debate. REUTERS/Mike Blake

33. Protester Raquel Cruz-Juarez joins others on the streets outside the Venetian Hotel, the site of the debate. REUTERS/David Becker

34. Decorations are seen behind the scenes at the debate. REUTERS/David Becker