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’s “corruption” is the focus of 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’s (I-Vt.) new presidential TV ad in Iowa released Monday.

“Donald Trump is the most corrupt president in American history,” Sanders says in the new 30-second spot, before delving into a broader focus on rooting out a system of corruption in America.

“But the greed and corruption undermining our democracy is bigger than one man, and so is the solution,” the new “Belongs to Us” ad continues. “When we stand together, we will make billionaires pay their fair share, provide better wages for workers and equal pay for women. We will expand Social Security and guarantee health care for all.” ADVERTISEMENT

The ad release comes a week after The New York Times reported the Sanders campaign will spend $30 million on TV ads in the first four primary and caucus states of 2020 and California.

Last week the campaign also launched a $1 million ad buy in New Hampshire.

Sanders campaigned in Iowa over the weekend with Rep. Alexandria Ocasio-Cortez Alexandria Ocasio-CortezOn 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 McCarthy says there will be a peaceful transition if Biden wins Anxious Democrats amp up pressure for vote on COVID-19 aid MORE (D-N.Y.), the firebrand freshman representative who endorsed the senator’s 2020 campaign. The rallies drew the largest crowds of any rally in the state of this election cycle, according to Sanders's campaign.

A RealClearPolitics average of polls has Sanders in third, behind 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 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.) in the race for the nomination

A survey from Quinnipiac University Poll released last week had Sanders, Biden, Warren 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 in a statistical tie.