Barr echoes Trump's concerns about mail-in voting, says it could 'open the floodgates of potential fraud'

Attorney General William BarrBill BarrOVERNIGHT DEFENSE: Key impeachment witness retires | Duckworth presses for information | Subpanel advances defense measure | Democrats press for end to military transgender ban DOJ to resume executions next week for first time in 15 years Tim Scott says he's talking with House Democrats about reviving police reform bill MORE echoed concerns from President TrumpDonald John TrumpKimberly Guilfoyle reports being asymptomatic and 'feeling really pretty good' after COVID-19 diagnosis Biden says he will rejoin WHO on his first day in office Lincoln Project offers list of GOP senators who 'protect' Trump in new ad MORE over mail-in voting, saying the method could be particularly susceptible to fraud.

"The thing we have going for us, especially when there's intense division in the country, is that we have peaceful transfers of power and a way of resolving it is to have an election," Barr said in an interview that will air this Sunday on Fox News' "Sunday Morning Futures" with anchor Maria BartiromoMaria Sara BartiromoPoliticians, scientists back masks: They work Donald Trump Jr: It's not 'too complicated to wear a mask' Barr echoes Trump's concerns about mail-in voting, says it could 'open the floodgates of potential fraud' MORE

"But when state governments start adopting these practices like mail-in ballots, that open the floodgates of potential fraud, then people's confidence in the outcome of the election is going to be undermined," he added.

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The remarks echoed comments from Trump, who has warned without evidence that mail-in voting will harm Republicans and lead to widespread fraud.

“MAIL-IN VOTING WILL LEAD TO MASSIVE FRAUD AND ABUSE. IT WILL ALSO LEAD TO THE END OF OUR GREAT REPUBLICAN PARTY. WE CAN NEVER LET THIS TRAGEDY BEFALL OUR NATION,” Trump tweeted last month. 

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Experts have said that fraud is slightly more common among mail-in ballots than other forms of voting, but widespread fraud is not an issue among all formats of voting.

Michigan, Ohio, Wisconsin and Connecticut are all sending voters absentee ballot applications, and New Hampshire and Massachusetts have eased requirements for absentee voting. California Gov. Gavin NewsomGavin NewsomWatch live: California Gov. Newsom holds coronavirus briefing Vote-by-mail would create chaos and distrust in November The Hill's Coronavirus Report: DC's Bowser says protesters and nation were 'assaulted' in front of Lafayette Square last month; Brazil's Bolsonaro, noted virus skeptic, tests positive for COVID-19 MORE (D) also signed an executive order Friday to send every registered voter in California a mail-in ballot. 

The debate over voting by mail has been heightened after several primaries were marred by long lines and crowded polling stations, raising health concerns during the coronavirus outbreak.