Sen. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.) in an interview broadcast Sunday pushed back on a comment made by 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 in which the former vice president called himself the most progressive 2020 presidential candidate.

"You know, I think if you look at Joe's record, and you look at my record, I don't think there's much question about who's more progressive," Sanders said on ABC's "This Week."

ADVERTISEMENT

Sanders said that his stances on the war in Iraq, trade agreements and Wall Street regulation show that he has been more progressive than Biden.

"Joe voted for the war in Iraq. I led the effort against it. Joe voted for NAFTA permanent normal trade relations-- trade agreements with China. I led the effort against that. Joe voted for the deregulation of Wall Street. I voted against that," he said.

Bernie Sanders on Joe Biden saying he's most progressive: "Joe voted for the war in Iraq. I led the effort against it… Joe voted for the deregulation of Wall Street, I voted against that… I don't think there's much question about who's more progressive" https://t.co/d1DwL6E3Jr pic.twitter.com/uiCrdJ6JYA — This Week (@ThisWeekABC) May 5, 2019

Biden said in March, before he entered the presidential race, that he has "the most progressive record of anybody running for the ... anybody who would run."

Biden and Sanders are among more than 20 people vying for the Democratic Party's 2020 presidential nomination. Both are considered frontrunners, with Biden leading in most polls.