Democratic presidential hopeful Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE's campaign on Tuesday released a TV ad in Iowa highlighting national unity as he rises in state and national polls.

The ad, which is Buttigieg's sixth in the state, includes excerpts from his speech at last week's Liberty and Justice Celebration in Des Moines.

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"The point is what lies on the other side of the fight," the South Bend, Ind., mayor said in the speech. "The hope of an American experience defined not by exclusion but by belonging. That is what we are here to deliver."

Buttigieg has risen from the middle of the Democratic primary's field to fourth place, trailing 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 and Sens. 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 (D-Mass.) and Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.).

A New York Times-Siena College survey released last week showed Warren leading the field in the Hawkeye State with the support of 22 percent of respondents, followed by Sanders at 19 percent and Buttigieg and Biden at 18 and 17 percent, respectively.

Meanwhile, Buttigieg made gains in a Washington Post-ABC News poll released on Sunday, but still trails Biden, Warren and Sanders nationally.

Buttigieg made headlines over the weekend when he suggested that the Democratic primary could turn into a two-way race between him and Warren.

He later walked back the remarks, however, saying he did not think the comments came out right before emphasizing the strength of the other contenders in the race.