Arnold Schwarzenegger says Libertarian presidential nominee Gary Johnson Gary Earl JohnsonWhat the numbers say about Trump's chances at reelection Presidential race tightens in Minnesota as Trump plows resources into state The Hill's Campaign Report: Biden condemns violence, blames Trump for fomenting it l Bitter Mass. primaries reach the end l Super PAC spending set to explode MORE and his running mate Bill Weld belong in the debates.

“The American people want to hear the voices of Governors Gary Johnson and Bill Weld in the debates this fall — in a recent USA Today poll, 76 percent of voters said they deserve a spot on the stage. I completely agree,” the former California governor wrote on his Facebook page Friday.

“Our political system benefits when we open the conversation instead of closing it — which is why I fought for and the voters passed open primaries in California and why I hope the Commission on Presidential Debates will listen to the people and include the governors.”

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Pressure is mounting on Johnson to secure a place in the first presidential debate scheduled for Sept. 26 at Hofstra University in Hempstead, N.Y.

The Commission on Presidential Debates requires third-party candidates to reach 15 percent in an average of five polls it has selected to qualify.

The Libertarian presidential ticket has just 15 days to improve its polling, which currently stands at about 9 percent nationwide.

Republican nominee Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE on Thursday said he would prefer Johnson and Green Party nominee Jill Stein to stay off the stage.

"I’d rather it be Hillary and myself. We’re the only two with a chance at winning," he said on RT America Thursday night.

2012 GOP nominee Mitt Romney, a vocal opponent of Trump, has also called for the Libertarian ticket to be included in the debates.

“I hope voters get to see former GOP governors Gary Johnson and Bill Weld on the debate stages this fall,” the former Massachusetts governor tweeted Wednesday.

Johnson has repeatedly argued participating in the debates is essential for his chances at the White House.

Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE, the Democratic presidential nominee, leads Trump by about 2 points nationwide in a four-way matchup.