Pollster Mallory Newall told Hill.TV's "What America's Thinking" on Monday that voters associate former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE most with being an electable candidate.

"Right now, what people are thinking about in terms of Joe Biden is electability," Newall, research director at Ipsos Public Affairs, told host Jamal Simmons.

"We did some polling recently to ask about people's priorities for the 2020 race. What sort of traits are important in a candidate when thinking about who to vote for, and then which of the top leading candidates most embody those," she continued.

"Joe Biden far and wide is seen as the one who can beat Trump in the general election," she said.

Recent polling shows the former vice president defeating President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE in hypothetical match-ups.

A CNN survey, released last month, shows Biden leading Trump 51 percent to 45 percent.

Trump has ramped up his attacks on Biden in recent weeks, including criticism on Wednesday after a firefighters union endorsed the former vice president, suggesting he could see the former vice president as a major threat at the outset of the 2020 race.

— Julia Manchester