Democratic presidential candidate Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE launched a petition on Sunday urging the Democratic National Committee to reverse its decision to lift a ban on campaign contributions by lobbyists, according to the International Business Times.

Sanders called the rollback "an unfortunate step backward," the news outlet reported, adding that the Vermont senator called President Obama's decision in 2008 to ban contributions from political action committees and lobbyists a "noble step."

The senator's campaign also urged rival Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE to push back against the DNC's decision.

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“We support the restrictions that President Obama put in place, and we hope Secretary Clinton will join us in supporting the president,” campaign representative Michael Briggs told the IB Times.

“If we are to restore a vibrant democracy in this country, it is long past time to break the link between money and special-interest favors in politics,” campaign manager Jeff Weaver said in an email sent to supporters, according to the outlet.

The DNC last week rolled back restrictions that put a ban on donations from federal lobbyists and PACs.

“The DNC’s recent change in guidelines will ensure that we continue to have the resources and infrastructure in place to best support whoever emerges as our eventual nominee,” Mark Paustenbach, a DNC spokesman, told The Washington Post in an email.

“Electing a Democrat to the White House is vital to building on the progress we’ve made over the last seven years.”