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Hillary Clinton: Biden 'should not concede under any circumstances'

Former Secretary of State Hillary ClintonHillary Diane Rodham ClintonPelosi on power in DC: 'You have to seize it' Cuba readies for life without Castro Chelsea Clinton: Pics of Trump getting vaccinated would help him 'claim credit' MORE said in a new interview that Democratic presidential nominee Joe BidenJoe BidenFour members of Sikh community among victims in Indianapolis shooting Overnight Health: NIH reverses Trump's ban on fetal tissue research | Biden investing .7B to fight virus variants | CDC panel to meet again Friday on J&J On The Money: Moderates' 0B infrastructure bill is a tough sell with Democrats | Justice Dept. sues Trump ally Roger Stone for unpaid taxes MORE "should not concede under any circumstances" because she believes the final results in November's election are "going to drag out" due to mail-in voting.

"Joe Biden should not concede under any circumstances because I think this is going to drag out, and eventually, I do believe he will win if we don't give an inch and if we are as focused and relentless as the other side is," Clinton told former aide Jennifer Palmieri on Showtime's "The Circus."

"I think that [Republicans] have a couple of scenarios that they are looking toward. One is messing up absentee balloting. They believe that helps them so that they then get maybe a narrow advantage in the Electoral College on Election Day," Clinton, the 2016 Democratic nominee, alleged. "So we've got to have a massive legal operation, and I know the Biden campaign is working on that."

In a surprise appearance at the Republican National Convention on Monday, President TrumpDonald TrumpFreedom Caucus member condemns GOP group pushing 'Anglo-Saxon political traditions' MyPillow CEO Mike Lindell's new free speech site to ban certain curse words Secret Facebook groups of special operations officers include racist comments, QAnon posts: report MORE told delegates that expansion of access to mail-in voting was politically driven.

"What they’re doing is using COVID to steal an election," Trump argued. "They’re using COVID to defraud the American people, all of our people, of a fair and free election. We can’t do that."

Many political observers have said it is unlikely a winner will be able to be declared on Election Day due to the delays that come with mail-in voting.