Behind the Scenes of the First Presidential Debate

Rev. Jesse Jackson is interviewed ahead of the debate at Hofstra University.

Mark Cuban talks to a crowd of reporters.

Rudy Giuliani is seen ahead of the first presidential debate at Hofstra.

Republican vice presidential candidate Mike Pence and Gov. of New Jersey Chris Christie meet before the event. 

A sign outside of Hofstra University is reflected in a TV camera lens.

A camera takes position and the stage is readied for the main event.

A reporter wears a wire ahead of the first presidential debate.

Moderator Lester Holt is seen at NBC's presidential debate at Hofstra University in Hempstead, N.Y. on Sept. 26, 2016.

Republican presidential nominee Donald Trump and Democratic presidential nominee Hillary Clinton arrive on stage for the first presidential debate.

Republican presidential nominee Donald Trump and Democratic presidential nominee Hillary Clinton answer questions from NBC Nightly News anchor and moderator Lester Holt.