Jill Stein

Green Party presidential candidate Jill Stein delivers remarks at Wilkes University in Wilkes-Barre, Pa. on Wednesday, Sept. 21, 2016.

(Christopher Dolan | The Citizens' Voice | AP)

Green Party candidate Jill Stein has been escorted from the first presidential debate between Donald Trump and Hillary Clinton.

CNN reports Stein was told to leave the Hofstra University campus Monday evening because she didn't have credentials to attend. Stein's campaign told the cable news network that she was scheduled for an interview with MSNBC when Hofstra security and Nassau County police intervened and escorted her off.

"What I am really hoping to accomplish is what the American people are hoping to accomplish, which is to open up the debates so we have a fair and inclusive debate at a time where the American people rejected the two establishment candidates at record levels," Stein told MSNBC. "They have a right not only to vote -- they have a right to know who we can vote for."

Stein and Libertarian Party candidate Gary Johnson did not reach the required 15 percent in national polls to appear on stage opposite the Democratic and Republican party candidates.

She instead promised to "go head to head with Clinton and Trump" on Twitter, inviting Americans to ask her questions with the hashtag #HeyJill and #OccupyTheDebates.

Watch me go head to head with Clinton and Trump tonight as I join the #Debates2016 online right here on Twitter. Use #HeyJill for questions! pic.twitter.com/BvUqk53OgE — Dr. Jill Stein🌻 (@DrJillStein) September 26, 2016

According to USA Today, Stein previously tried to crash the presidential debate in 2012. She was arrested for disorderly conduct.

Stein's press director Meleiza Figueroa said a group of supporters were being bused in Monday night to attempt to "escort Jill in," despite expecting them to be "unsuccessful." If Stein isn't allowed in, she'll hold "a people's debate outside the crowd," Figueora added.

Reporter Matt Bernstein shared video of at least two Stein supporters being arrested for protesting outside Hofstra University.

The debate between Trump and Clinton begins at 9 p.m. Follow live updates here.

Editor's note: A previous version of this story said Jill Stein had handcuffed herself to a chair at the 2012 debate at Hofstra University. Stein says the police handcuffed her to a chair.