Billionaire presidential candidate Tom Steyer Tom SteyerTV ads favored Biden 2-1 in past month Inslee calls Biden climate plan 'perfect for the moment' OVERNIGHT ENERGY: Trump administration finalizes plan to open up Alaska wildlife refuge to drilling | California finalizes fuel efficiency deal with five automakers, undercutting Trump | Democrats use vulnerable GOP senators to get rare win on environment MORE has spent more money on campaign advertisements than every other candidate for the White House in 2020, including seven times more than President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE.

Steyer, a Democratic philanthropist who has made impeaching Trump his signature campaign issue, had funneled $30 million to TV and radio ads as of Monday, NBC News reported, citing data from Advertising Analytics. Trump and South Bend, Ind., Mayor 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 (D) follow Steyer with $4 million and $2 million spending on ads, respectively.

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The majority of Steyer’s ads have aired in early primary states, including $7.1 million spent in Iowa, $7 million in New Hampshire, $6.3 million in South Carolina and $5 million tin Nevada, according to NBC. He tops the list of most spending on ads in all four of those states.

Buttigieg is the runner-up in Iowa with $2 million, Sen. Amy Klobuchar Amy Klobuchar3 reasons why Biden is misreading the politics of court packing Social media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight MORE (D-Minn.) spent the second-most in New Hampshire at $514,000 and Trump’s reelection campaign sent $549,000 and $457,000 for ads in South Carolina and Nevada, respectively.

The Steyer campaign did not immediately return a request for comment.

Steyer, who entered the 2020 primary relatively late after first declining to run, has qualified for the November Democratic debate, along with eight other candidates. He has lagged in the polls, remaining in single digits as candidates such as 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, Sen. 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.) and 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 (D-Mass.) have built up double-digit support.