Poll: 40 percent of Democrats say candidates should be discussing Hunter Biden

Forty percent of Democratic voters said in a new Hill-HarrisX poll that 2020 candidates should be discussing the business dealings of former Vice President Joe BidenJoe BidenBiden alleges Sanders campaign 'doctored video' to attack him on Social Security record Sanders campaign responds to Biden doctored video claims: Biden should 'stop trying to doctor' public record Capt. "Sully" Sullenberger pens op-ed in defense of Biden: 'I stuttered once, too. I dare you to mock me' MORE’s son, Hunter Biden.

The survey, released just hours before the fourth Democratic presidential primary debate, found that 64 percent of Republicans also said Hunter Biden’s business ventures in Ukraine should be a campaign focus. Fifty-four percent of independents agreed.

Respondents overall were almost evenly split on the issue.

Fifty-two percent said Hunter Biden’s business dealings in Ukraine should be discussed, while 48 percent said it wasn’t an important campaign issue.

The survey comes amid increased scrutiny of Hunter Biden’s various business dealings.

In an interview with ABC News that aired Tuesday morning, Hunter Biden said he made a mistake by getting involved with foreign companies before considering the political implications. But he maintained that he did not engage in any wrongdoing.

"I gave a hook to some very unethical people to act in illegal ways to try to do some harm to my father,” he told the network. “That's where I made the mistake.”

Hunter Biden also took aim at President TrumpDonald John TrumpTrump's newest Russia adviser, Andrew Peek, leaves post: report Hawley expects McConnell's final impeachment resolution to give White House defense ability to motion to dismiss Trump rips New York City sea wall: 'Costly, foolish' and 'environmentally unfriendly idea' MORE and his allies, who have seized on his business dealings to paint the Biden family as corrupt.

“What I regret is not taking into account that there would be a Rudy GiulianiRudy GiulianiDemocrats file brief against Trump, 'the Framers' worst nightmare' Trump lawyers attack House impeachment as 'brazen and unlawful' effort to overturn 2016 results Sunday shows preview: Lawmakers gear up for Senate impeachment trial MORE and a president of the United States that would be listening to this ridiculous conspiracy idea,” he said.

The interview came just hours before the fourth Democratic debate in Ohio, where Joe Biden will take center stage.

Biden's fellow White House hopefuls have largely avoided speaking critically about Hunter Biden.

"Mr. President, telling lies about Joe Biden won't protect you from the truth," Sen. Kamala HarrisKamala Devi HarrisParnas pressure grows on Senate GOP Sanders defends vote against USMCA: 'Not a single damn mention' of climate change The Hill's Morning Report — President Trump on trial MORE (D-Calif.) tweeted earlier this month. "Joe has more patriotism in his pinky finger than you'll ever have."

The Hill-HarrisX survey was conducted online among 1,001 registered voters. The margin of error for the full sampling is plus or minus 3.1 percentage points.

—Tess Bonn