Sen. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.) is facing scrutiny by former Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE aides for his use of private jets in a Politico report published Monday.

Sanders, who recently declared his presidential candidacy for 2020, reportedly made repeated requests to use private jets for him and his staff while serving as a campaign surrogate for Clinton, the Democratic nominee, during the 2016 presidential race.

According to Politico, Sanders has spent at least $342,000 on private flights since 2016.

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“I’m not shocked that while thousands of volunteers braved the heat and cold to knock on doors until their fingers bled in a desperate effort to stop Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE, his Royal Majesty King Bernie Sanders would only deign to leave his plush D.C. office or his brand new second home on the lake if he was flown around on a cushy private jet like a billionaire master of the universe,” Zac Petkanas, who was the director of rapid response for the Clinton campaign, told Politico.

Sanders's request for private jets reportedly became a point of conflict between him and the Clinton campaign, six former staffers and one other person familiar with the Vermont lawmaker's travel told the publication.

“We would try to fight it as much as possible because of cost and availability of planes, but they would request [a jet] every time,” one of those sources said. “We would always try to push for commercial. ... At the campaign, you’re constantly trying to save like 25 cents.”

Before figuring out Sanders's travel plans “our working assumption was that 90 percent of the time it would be commercial,” another person familiar with the matter told Politico. “If he was trying to hop from city to city in a particular state and [commercial] didn’t work, we were open to” chartering a plane.

Sanders spokesperson Arianna Jones told Politico that the chartered flights were needed to get to as many locations as quickly as possible. She noted that Sanders held 39 rallies in 13 states on behalf of Clinton’s campaign, including 17 events in 11 states in the last week alone.

“That’s why chartered flights were used: to make sure Sen. Sanders could get to as many locations as quickly as possible in the effort to help the Democratic ticket defeat Donald Trump,” Jones said. “Sen. Sanders campaigned so aggressively for Secretary Clinton, at such a grueling pace, it became a story unto itself, setting the model for how a former opponent can support a nominee in a general election.”

Asked how Sanders will fly for his 2020 campaign, Jones said he “will be flying commercial whenever possible. The campaign will consider the use of charter flights based on a variety of factors, including security requirements, logistics, and media interest in traveling with the senator.”

Rania Batrice, who served as Sanders’s deputy campaign manager at the end of his 2016 campaign, told Politico that “at no point did I ever say ‘he has to have a private plane for the sake of having a private plane’” when discussing campaign travel with the Clinton campaign.

“The requests for a charter only came after the schedules were put in front of us. If a less rigorous schedule were put in front of us, we wouldn’t have needed a charter and that would have been fine for everyone involved, including Bernie,” she said.

One veteran Democratic operative who dealt with surrogates for past presidential campaigns told Politico that providing private planes is standard practice for the most important surrogate in the general election.

The Sanders campaign did not immediately respond to The Hill's request for comment on the report.