"It's time Democratic voters in Iowa know who the real Beto O'Rourke is - an entitled, corrupt political climber", Club for Growth Action President David McIntosh wrote in a statement. The spot paints the former Texas congressman as a politician dripping with "white male privilege" who's undeserving of the comparisons he's drawing to Barack Obama.
The offensive represents the GOP's first concerted effort to wreak havoc in the Democratic race, and it arrives as senior Republicans have begun deliberating how the party should seek to influence the Democratic primary.
His unorthodox and ultimately unsuccessful Senate campaign, which shunned traditional strategists and instead relied on the candidate's organic appeal, broke fundraising records and earned O'Rourke a national profile that catapulted him into the presidential discussion. "We are excited to share it with everyone soon".
While he has not formally announced his bid for the presidency, O'Rourke has been polling as a top three contender for the Democratic nomination.
O'Rourke has also been running ads on Facebook teasing an upcoming announcement, another sign that he is looking to engage the base of supporters he gained during his Senate bid.
Beto O'Rourke is headed to Iowa this weekend.
Former Texas Congressman Beto O'Rourke will be in Cedar Falls this Saturday to campaign for Eric Giddens, the Democratic candidate for Iowa Senate District 30.More news: India scores 358/9 in fourth ODI against Australia, Dhawan scores a ton
More news: Venezuelan blackout victims 'murdered' by government, opposition leader says
More news: Alabama's Hannah Brown is ABC's next 'Bachelorette
Washington Governor Jay Inslee speaks during a rally at the beginning of the March For Science in Seattle, Washington, U.S. April 22, 2017.
In addition to O'Rourke's trip to Iowa, he is also planning to visit other early states in the primary calendar.
O'Rourke's video for Giddens focuses on getting out the vote among students at the University of Northern Iowa.
O'Rourke is in his hometown of El Paso, Texas, this week ahead of his Iowa trip. "It's the only way to ensure that you've done everything you possibly can for this country, when she needs you the most".
The Democrat has been highly critical of US President Donald Trump's immigration policies.
O'Rourke, who a year ago lost his bid to unseat Sen.