2nd GOP debate - highlights

The field of Republican presidential candidates took on front-runner Donald Trump in the second GOP debate on September 16, 2015.

In this photo, Republican U.S. presidential candidate businessman Donald Trump (L) speaks as former Florida Governor and fellow candidate Jeb Bush reacts during the debate at the Ronald Reagan Presidential Library in Simi Valley, California.

GOP debate

Republican U.S. presidential candidates including (L-R) Dr. Ben Carson, businessman Donald Trump, former Florida Governor Jeb Bush and Wisconsin Governor Scott Walker pose for a group photo before the start of the second official Republican presidential candidates debate of the 2016 U.S. presidential campaign at the Ronald Reagan Presidential Library in Simi Valley, California, September 16, 2015.

GOP debate

Republican U.S. presidential candidates (L-R) including former U.S. Senator Rick Santorum, former New York Governor George Pataki, U.S. Senator Rand Paul, former Arkansas Governor Mike Huckabee, U.S. Senator Marco Rubio, U.S. Senator Ted Cruz, Dr. Ben Carson, businessman Donald Trump, former Florida Governor Jeb Bush, Wisconsin Governor Scott Walker, former CEO Carly Fiorina, Ohio Governor John Kasich and New Jersey Governor Chris Christie pose before the start of the second official Republican presidential candidates debate of the 2016 U.S. presidential campaign at the Ronald Reagan Presidential Library in Simi Valley, California, September 16, 2015.

GOP debate

Republican presidential candidate and former Hewlett Packard CEO Carly Fiorina speaks during the second official Republican presidential candidates debate of the 2016 U.S. presidential campaign at the Ronald Reagan Presidential Library in Simi Valley, California, United States, September 16, 2015.

GOP debate

Republican U.S. presidential candidates businessman Donald Trump (L) and former Florida Governor Jeb Bush shake hands during a commercial break at the second official Republican presidential candidates debate of the 2016 U.S. presidential campaign at the Ronald Reagan Presidential Library in Simi Valley, California, United States, September 16, 2015.

GOP debate

Republican U.S. presidential candidate businessman Donald Trump (L) reacts to former Florida Governor Jeb Bush during the second official Republican presidential candidates debate of the 2016 U.S. presidential campaign at the Ronald Reagan Presidential Library in Simi Valley, California, September 16, 2015.

GOP debate

Republican U.S. presidential candidates Ohio Governor John Kasich (L) and New Jersey Governor Chris Christie react during the second official Republican presidential candidates debate of the 2016 U.S. presidential campaign at the Ronald Reagan Presidential Library in Simi Valley, California, September 16, 2015.

GOP debate

Republican U.S. presidential candidate businessman Donald Trump speaks during the second official Republican presidential candidates debate of the 2016 U.S. presidential campaign at the Ronald Reagan Presidential Library in Simi Valley, California, September 16, 2015.

GOP debate

Republican U.S. presidential candidate and former Arkansas Governor Mike Huckabee speaks during the second official Republican presidential candidates debate of the 2016 U.S. presidential campaign at the Ronald Reagan Presidential Library in Simi Valley, California, September 16, 2015.

GOP debate

Republican U.S. presidential candidates Dr. Ben Carson (L) and former Florida Governor Jeb Bush (R) listen as businessman Donald Trump speaks during the second official Republican presidential candidates debate of the 2016 U.S. presidential campaign at the Ronald Reagan Presidential Library in Simi Valley, California, September 16, 2015.

GOP debate

Republican U.S. presidential candidate and Ohio Governor John Kasich makes a point during the second official Republican presidential candidates debate of the 2016 U.S. presidential campaign at the Ronald Reagan Presidential Library in Simi Valley, California, September 16, 2015.

GOP debate

Members of the news media watch on television monitors in the media center as Republican U.S. presidential candidate businessman Donald Trump speaks during the second official Republican presidential candidates debate of the 2016 U.S. presidential campaign at the Ronald Reagan Presidential Library in Simi Valley, California, September 16, 2015.

GOP debate

Republican U.S. presidential candidate and former New York Governor George Pataki has his microphone adjusted by a technician during a commercial break in the midst of a debate between the lowest polling candidates held as part of the second official Republican presidential candidates debate of the 2016 U.S. presidential campaign at the Ronald Reagan Presidential Library in Simi Valley, California, September 16, 2015.

GOP debate

Republican U.S. presidential candidate and U.S. Senator Lindsey Graham makes a point during a debate between the lowest polling candidates held as part of the second official Republican presidential candidates debate of the 2016 U.S. presidential campaign at the Ronald Reagan Presidential Library in Simi Valley, California, September 16, 2015.

GOP debate

Republican U.S. presidential candidates (L-R) Dr. Ben Carson, businessman Donald Trump and former Florida Governor Jeb Bush talk before the start of the second official Republican presidential candidates debate of the 2016 U.S. presidential campaign at the Ronald Reagan Presidential Library in Simi Valley, California, September 16, 2015.

GOP debate

Republican U.S. presidential candidate and businessman Donald Trump speaks during the second official Republican presidential candidates debate of the 2016 U.S. presidential campaign at the Ronald Reagan Presidential Library in Simi Valley, California, September 16, 2015.

GOP debate

Republican U.S. presidential candidate and former Florida Governor Jeb Bush speaks during the second official Republican presidential candidates debate of the 2016 U.S. presidential campaign at the Ronald Reagan Presidential Library in Simi Valley, California, September 16, 2015.

GOP debate

Republican U.S. presidential candidates Dr. Ben Carson (L) and businessman Donald Trump talk during a commercial break at the second official Republican presidential candidates debate of the 2016 U.S. presidential campaign at the Ronald Reagan Presidential Library in Simi Valley, California, September 16, 2015.