Former North Carolina state Sen. Cal Cunningham's (D) campaign announced Monday that he brought in more than $720,000 in the first two weeks of his campaign to unseat Sen. Thom Tillis Thomas (Thom) Roland TillisTillis appears to reinforce question about COVID-19 death toll Billionaire who donated to Trump in 2016 donates to Biden Collins: Winner of presidential election will be sworn in next year MORE (R-N.C.)

Cunningham raised more than $520,000 in contributions since the campaign's launch on June 17, in addition to a $200,000 candidate loan.

The campaign said 72 percent of Cunningham's donations were from North Carolina voters and that no corporate PAC funds were accepted by the campaign.

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Cunningham, an Iraq War veteran, announced his candidacy for the seat last month, as he looks to emerge from the Democratic primary to take on Tillis, who is widely considered to be one of the more vulnerable Republican senators in 2020.

A survey from the left-leaning Public Policy Polling last month, showed Cunningham leading Tillis, 41 percent to 40 percent.

An Emerson College poll released last month also showed Tillis trailing North Carolina state Sen. Erica Smith (D), another of his Democratic challengers, 46 percent to 39 percent.

Tillis is also facing a third Democratic challenger, Mecklenburg County Commissioner Trevor Fuller.

However, Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellTrump 'no longer angry' at Romney because of Supreme Court stance 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 The Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power MORE (R-Ky.) is set on maintaining his party's grip of the chamber, in which they have a 53-47 majority.

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 endorsed Tillis for reelection in a tweet last month.