A Democratic super PAC plans to use a mobile billboard to target Sen. Susan Collins Susan Margaret CollinsSenate Republicans face tough decision on replacing Ginsburg Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy What Senate Republicans have said about election-year Supreme Court vacancies MORE (R-Maine) when the impeachment trial kicks off in earnest next week in the Senate.

The Party Majority PAC is raising money to have the billboard stationed near the Senate office buildings in Washington, D.C., starting Tuesday, with the truck broadcasting remarks that Collins made during President Clinton's impeachment trial in 1999.

"I think we'll have the funding for the truck in the next hour," Adam Parkhomenko, a Democratic strategist, told The Hill on Thursday afternoon. "Our plan is to have the truck running on Tuesday for as long as we can."

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Parkhomenko posted a video on Twitter of Collins calling for "more evidence" and "witnesses" during the Clinton trial, with the GOP senator saying it was needed to "get to the truth" and to answer the Senate's "duty to do impartial justice."

So folks are aware: mobile billboards are banned in Maine. So we are going to humiliate Susan Collins in front of her colleagues instead https://t.co/JKLm0Dqhj0 — Adam Parkhomenko (@AdamParkhomenko) January 16, 2020

The GOP senator delivered the remarks in January 1999, when the Senate was debating whether to introduce new witnesses and evidence during Clinton's trial in the upper chamber.

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Collins, a potential swing vote in the Senate trial involving President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE, challenged Democrats on Wednesday for releasing newly obtained documents on the eve of the trial.

The senator suggested that House lawmakers "did an incomplete job" by only recently releasing the materials from Soviet-born businessman Lev Parnes.

"I do think that, as I said, it's important that we have an up-or-down vote on the issue of subpoenaing witnesses and documents," Collins said.

Parnas, a former associate of Trump's personal attorney Rudy Giuliani Rudy GiulianiGrand jury adds additional counts against Giuliani associates Lev Parnas and and Igor Fruman Juan Williams: Breaking down the debates Giuliani criticizes NYC leadership: 'They're killing this city' MORE, has said Trump was aware of efforts in Ukraine to dig up dirt on former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE, a political opponent.

Trump on Thursday denied having spoken with Parnas.

If the Democratic super PAC's fundraiser is successful, a billboard truck will be stationed near the Senate offices blasting clips of Collins asking for witness testimonies against Clinton.

The truck is part of Democrats' efforts to push the GOP to have witnesses for the Senate trial, demands that Republicans have so far rebuffed.

In addition to the Clinton trial footage, Parkhomenko mentioned that he would like to show older footage, such as the confirmation of Associate Supreme Court Justice Brett Kavanaugh Brett Michael KavanaughProgressive group to spend M in ad campaign on Supreme Court vacancy Senate Republicans face tough decision on replacing Ginsburg Trump reacts to Ginsburg's death: 'An amazing woman who led an amazing life' MORE and other remarks from Lindsey Graham Lindsey Olin GrahamSenate Republicans face tough decision on replacing Ginsburg Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy What Senate Republicans have said about election-year Supreme Court vacancies MORE (R-S.C.) calling for the trial to be completed quickly.