A political action committee that supports impeaching 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 is releasing advertisements seeking to raise pressure on Republican senators up for reelection next year.

The group Need to Impeach, which was founded by 2020 Democratic White House hopeful 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, will air ads this week targeting GOP Sens. Susan Collins Susan Margaret CollinsDemocratic senator to party: 'A little message discipline wouldn't kill us' Poll: 57 percent of Americans think next president, Senate should fill Ginsburg vacancy On The Trail: Making sense of this week's polling tsunami MORE (Maine), Joni Ernst Joni Kay ErnstOn The Trail: Making sense of this week's polling tsunami Tillis appears to reinforce question about COVID-19 death toll The power of incumbency: How Trump is using the Oval Office to win reelection MORE (Iowa), Cory Gardner Cory Scott GardnerBreaking the Chinese space addiction Trump dumbfounds GOP with latest unforced error Billionaire who donated to Trump in 2016 donates to Biden MORE (Colo.) and Martha McSally Martha Elizabeth McSallyOn The Trail: Making sense of this week's polling tsunami The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (Ariz.), according to Politico.

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The ad targeting Collins begins with a narrator asking "Should a president pressure a foreign leader to intervene in our elections?"

It then goes on to show clips of Trump, his lawyer Rudy Giuliani and White House chief of staff Mick Mulvaney Mick MulvaneyOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security Blockchain trade group names Mick Mulvaney to board Mick Mulvaney to start hedge fund MORE while discussing the ongoing Ukraine scandal, which is the focus of the House impeachment inquiry.

"Tell Sen. Collins it's time to put country over party," the ad concludes.

The Cook Political Report has rated the races for the Senate seats held by Collins, Gardner and McSally as toss-ups and has said Ernst's race is "likely" Republican.

Politico reported that Need to Impeach is spending $3.5 million on the ads.

Need to Impeach lead strategist Kevin Mack told the news outlet that the ads are focused on “dropping individual senators into this mess that’s going on in Washington."

The Hill reported earlier this month that Need to Impeach previously targeted senators in battleground states with a $3.1 million ad buy.