Clinton and Trump meet for their first presidential debate

Democratic presidential candidate Hillary Clinton is greeted by family, including former President Bill Clinton, daughter Chelsea Clinton, and son-in-law Marc Mezvinsky after the first presidential debate at Hofstra University.

Republican presidential candidate Donald Trump greets his wife Melania on stage after the first presidential debate at Hofstra University.

Republican presidential candidate Donald Trump gives a thumbs up on stage after the first presidential debate at Hofstra University.

Democratic presidential candidate Hillary Clinton shakes hands with moderator Lester Holt from NBC after the conclusion of the debate.

Republican presidential candidate Donald Trump and Democratic presidential candidate Hillary Clinton debate during the first presidential debate at Hofstra University.

Republican presidential candidate Donald Trump speaks on stage during the first presidential debate at Hofstra University.

Democratic presidential candidate Hillary Clinton speaks on stage during the first presidential debate at Hofstra University.

Democratic presidential nominee Hillary Clinton is seen on multiple screens speaking during the first presidential debate at Hofstra University.

Republican presidential nominee Donald Trump speaks as Democratic presidential nominee Hillary Clinton and Moderator Lester Holt listen during the presidential debate at Hofstra University.

Moderator Lester Holt from NBC talks with Republican presidential candidate Donald Trump speaks on stage during the first presidential debate at Hofstra University.

Democratic presidential candidate Hillary Clinton speaks on stage during the first presidential debate at Hofstra University.

Debate moderator Lester Holt is seen during the first presidential debate at Hofstra University.

Republican presidential candidate Donald Trump speaks on stage during the first presidential debate at Hofstra University.

Democratic presidential candidate Hillary Clinton speaks on stage during the first presidential debate at Hofstra University.

Republican presidential candidate Donald Trump listens on stage during the first presidential debate at Hofstra University.

Democratic presidential nominee Hillary Clinton looks on during the presidential debate at Hofstra University.

Republican presidential candidate Donald Trump listens on stage during the first presidential debate at Hofstra University.

Students cheer at an outdoor debate watch party, as the first presidential debate gets underway on the Hofstra University campus.

Roger Ailes, former Chairman and CEO of Fox News, was on hand at Hofstra University to watch the first presidential debate at an outdoor debate watch party sponsored by Fox.

Republican presidential nominee Donald Trump speaks as Democratic presidential nominee Hillary Clinton listens during the presidential debate at Hofstra University.

Democratic presidential candidate Hillary Clinton speaks on stage during the first presidential debate at Hofstra University.

Republican presidential nominee Donald Trump looks on during the presidential debate at Hofstra University.

Republican presidential candidate Donald Trump speaks on stage during the first presidential debate at Hofstra University.

Democratic presidential candidate Hillary Clinton speaks on stage during the first presidential debate at Hofstra University.

Democratic presidential candidate Hillary Clinton and Republican presidential candidate Donald Trump on stage during the first presidential debate at Hofstra University.

Democratic presidential candidate Hillary Clinton and Republican presidential candidate Donald Trump stand on stage before the first presidential debate at Hofstra University.

Democratic presidential candidate Hillary Clinton greets Republican presidential candidate Donald Trump on stage during the first presidential debate at Hofstra University. Moderator Lester Holt from NBC is bottom left.

Democratic presidential nominee Hillary Clinton takes the stage with Republican presidential nominee Donald Trump during the Presidential Debate at Hofstra University.

Moderator Lester Holt from NBC takes the stage before the first presidential debate at Hofstra University between Democratic presidential candidate Hillary Clinton and Republican presidential candidate Donald Trump.

Republican presidential nominee Donald Trump's wife, Melania Trump shake hands with Democratic presidential nominee Hillary Clinton's husband and former U.S. President Bill Clinton before the presidential debate at Hofstra University.

Democratic presidential nominee Hillary Clinton's husband and former U.S. President Bill Clinton talks with daughter, Chelsea Clinton during the Presidential Debate at Hofstra University.

Moderator Lester Holt from NBC takes the stage before the first presidential debate at Hofstra University between Democratic presidential candidate Hillary Clinton and Republican presidential candidate Donald Trump.

Boxing promoter Don King enters the hall before the first presidential debate at Hofstra University between Democratic presidential candidate Hillary Clinton and Republican presidential candidate Donald Trump.

Dallas Mavericks owner Mark Cuban inside the debate hall at Hofstra University before the debate begins.

Former New York City Mayor Rudy Giuliani kisses the hand of businessman Sheldon Adelson's wife Miriam Ochsorn hand before the presidential debate between Democratic presidential nominee Hillary Clinton and Republican presidential nominee Donald Trump.

Republican vice presidential candidate Mike Pence enters the hall before the first presidential debate at Hofstra University between Democratic presidential candidate Hillary Clinton and Republican presidential candidate Donald Trump.

Casino magnate Sheldon Adelson enters the hall before the first presidential debate at Hofstra University between Democratic presidential candidate Hillary Clinton and Republican presidential candidate Donald Trump.

A woman reads the official brochure inside the debate hall at Hofstra University before the debate begins.

Rep. Charles Rangel, D-NY, talks with with Jesse Jackson prior to the start of the debate.

An activist dressed up as a polar bear walks outside before the start of the first presidential debate between Hillary Clinton and Donald Trump at Hofstra University.

A Clinton supporter, left, argues with a Trump supporter, right, before the start of the debate.

Supporters of Hillary Clinton are seen outside the hall ahead of the debate.

Trump supporters walk outside prior to the start of the debate.

Students hold banners before the start of the first presidential debate between Hillary Clinton and Donald Trump at Hofstra University.

Television networks set up cameras outside the debate hall at Hofstra University hours before the official event begins.

A woman plays a beanbag game outside a student center several hours before the start of the first presidential debate between Hillary Clinton and Donald Trump at Hofstra University.

Vanessa Chouest, 18, a Hofstra University from Louisiana, was among about one hundred students who protested on campus before the start of the debate.

Hofstra University students stage a Black Lives Matter protest ahead of the first presidential debate between Hillary Clinton and Donald Trump at Hofstra University.

Hofstra University student Gianna Rojas, 19, has her photo taken between images of the two candidates ahead of the first presidential debate between Hillary Clinton and Donald Trump at Hofstra University.

Reporters work next door to the debate hall ahead of the first presidential debate between Hillary Clinton and Donald Trump at Hofstra University.

Jesse Jackson speaks with political commentator and former presidential advisor David Gergen ahead of the first presidential debate between Hillary Clinton and Donald Trump at Hofstra University.

Cheerleaders pose with a sign before the debate.

A seat is labeled for Republican presidential nominee Donald Trump's wife, Melania Trump before start of the debate.

Media work inside the hall hours before the start of the debate.

A member of the production team adjusts the lights on the stage in preparation for Monday night's presidential debate.

A producer walks past a podium as the stage is set for the evening's presidential debate between Democratic presidential candidate Hillary Clinton and Republican presidential candidate Donald Trump at Hofstra University in Hempstead, N.Y.

Lena Gjokaj takes a cellphone photo of the stage at Hofstra University.