Sen. Kamala Harris Kamala HarrisHundreds of lawyers from nation's oldest African American sorority join effort to fight voter suppression Biden picks up endorsement from progressive climate group 350 Action 3 reasons why Biden is misreading the politics of court packing MORE (D-Calif.) called President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE "a predator" at a campaign event in Iowa, delivering one of her sharpest attacks on the man she seeks to defeat in 2020.

“I know predators and we have a predator living in the White House," Harris said to applause during a picnic in West Des Moines.

"Donald Trump has predatory nature and predatory instincts," she continued. "The thing about predators is that they prey on the vulnerable. They prey on those who they do not believe are strong. The thing about predators you must importantly know [is] predators are cowards."

HAPPENING NOW: Sen. Kamala Harris attends West Des Moines Democrats' 4th of July picnic. https://t.co/d8UbRkBi6m — ABC News (@ABC) July 3, 2019

Harris made a similar comment last month when she told an audience at the NAACP in South Carolina that she knew how to take on predators as a result of her career as a prosecutor.

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The senator has seen newfound media attention and a boost in the polls since her debate performance in Miami last week.

Harris confronted front-runner and former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE on the stage, taking aim at his civil rights record as a senator in the 1970s.

A new Reuters/Ipsos poll released on Wednesday showed overtaking fellow Sen. Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (D-Mass.) in third place, coming in with 10 percent support, up from six percent.