Ralph Nader said Friday that Bernie SandersBernie SandersPelosi: 'Of course' Dems can be against abortion Kasich: 'I think political parties are on their way out' Sanders: Democratic Party's model is 'failing' MORE seems “more authentic” on Wall Street than fellow Democratic presidential candidate Hillary ClintonHillary Rodham ClintonPoll: 85 percent of Clinton supporters would vote for her again OMB director: Government shutdown not a 'desired end' Poll: Almost half say Trump off to poor start MORE.

“I think a lot of people see that Bernie Sanders is more authentic in saying what he means and meaning what he says,” he said told host Maria Bartiromo on Fox Business Network’s “Mornings with Maria."

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“It’s the usual difference between political rhetoric and political deed,” added Nader, who sought the White House five times under three different political party affiliations.

Nader argued that Clinton does not seem transparent the longer she keeps details of her paid speeches for Wall Street’s major financial firms private.

“She’s got to release whatever tapes and transcripts there are of those meetings,” he said. "Why is she keeping it secret? Maybe it’s because she was reassuring these groups that what she’s going to do on the campaign trail is quite different than what she would do if she ever got in office."

“She supported a lot of concessions to these industries by [former President] Bill ClintonBill ClintonLe Pen and the right wing hit a wall in French vote Bill Clinton jokes Clinton Center 'has been bugged' NYT: Comey distrusted Lynch on Clinton MORE,” he added. "She wasn’t very forthcoming in the Senate on these issues.”

Nader added that the GOP presidential primary deserved the same media vetting, singling out Republican presidential front-runner Donald TrumpDonald TrumpTrump's Hollywood Walk of Fame star defaced Report: Senate's Russia probe understaffed Trump won't comment on Le Pen's advancement in French election MORE’s business background.

“Donald Trump brags about his business acumen and success, but he has not released his voluminous tax returns,” he said. "I think he’s delaying and delaying."

“You don’t have to legally, but if you’re going to brag about business success as an asset to go to the White House, you better tell people in thousands of pages over the years what you’ve been doing,” Nader added.

“I think that’s a very, very important thing for the press to demand. It can’t be dragged down to the level of grunts and slurs and attacks in the Republican camp."