Former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE said on Monday that he was more of a Democrat than most of the candidates running in the 2020 Democratic primary.

"I'm more of a Democrat from my shoe sole to my ears than about anybody running in this party, OK?" Biden told an audience at a CNN town hall in Grinnell, Iowa.

Biden was responding to a Medium post he wrote last week, in which he criticized progressive Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE's (D-Mass.) approach to politics.

"Including her?" host Erin Burnett asked.

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"Including everyone," he responded.

The Democratic primary has gotten increasingly competitive at the national level, as well as in a number of early contest states including Iowa.

Biden, who was once seen as the race's solid front-runner, has fallen behind Warren in a number of state-level polls.

The two candidates traded barbs last week after Warren suggested Biden's reasons for not supporting "Medicare for All" seemed like they were coming from someone “running in the wrong presidential primary.”

Biden fired back in the Medium post without naming Warren, saying “these kinds of attacks are a serious problem” and “reflect an angry unyielding viewpoint that has crept into our politics.”

The former vice president also said that such an “approach to politics” is “condescending” and “elitist.”

"I wasn't talking about her," Biden said on Monday. "I was talking about the attitude that 'if you don't agree with me, get in the other party.' "