Sen. Lindsey Graham, R-S.C., pushed back against media outlets that have projected Democrat Joe Biden as the winner of the 2020 election, stating Sunday morning that "this is a contested election" that has not reached a conclusion.

In an interview with Fox News' "Sunday Morning Futures," Graham pointed to several allegations of possible fraud or error that could have altered the election's results. He called on fellow Republicans to push back against the idea that Biden's victory is a done deal, warning that if they do not, it will set a precedent that would be disastrous for their party.

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"If Republicans don’t challenge and change the U.S. election system, there’ll never be another Republican president elected again," Graham warned. "President Trump should not concede, we’re down to 10,000 votes in Georgia, he’s going to win North Carolina, we’ve gone from 93,000 votes to 20,000 votes in Arizona, where there are more votes to be counted. There are allegations of system failure, fraud."

Graham also said that the election computer system in Michigan is suspicious, and told Republican Senate candidate John James not to concede. Like President Trump, James looked to be in a position to win on election night, only to have absentee ballots put his Democratic opponent ahead the following night.

Graham delved into some of the allegations that have come up since election night. He said that Trump’s team canvassed early voters in Pennsylvania and found more than 100 people they believe were dead, with at least 15 Graham said who were confirmed dead. He also said Trump’s camp found six instances in Pennsylvania where people were registered to vote after they died, and then votes were cast in their names.

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The senator also said that the FBI, the Postal Inspector, and the Senate Judiciary Committee will be looking into a postal worker in Erie, Pa., who claims that supervisors were backdating ballots that were being sent out so they would appear to have been sent on Election Day instead of after.

“I don’t know where that goes,” Graham said, before repeating his claim that there is evidence of dead people being registered to vote and having ballots in their names.

“So to my Republican colleagues out there: We have to fight back or we will accept our fate. I want Pennsylvania to explain to the American people how six people after they die can register to vote in Pennsylvania. I want the computer system in Michigan that flipped votes from Republicans to Democrats to be looked at.”

Graham went on to say that “there’s a lot of shenanigans going on,” and that President Trump should indeed fight in court.

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Prior to the election, Trump and other Republicans had warned that large-scale mail-in voting would complicate the election and leave it exposed to risks of fraud. Graham on Sunday claimed that these concerns were well-founded.

"The post office is the new election center. It’s the wild, wild west when it comes to mail-in balloting, everything we worried about has come true," he said. "So if we don’t fight back in 2020 we’re never going to win again presidentially. A lot’s at stake here."