Democrats are struggling to find an opening in their fight to sink Brett Kavanaugh’s Supreme Court nomination.

They can’t block the nominee on their own, but they’re under intense pressure from liberals to wage a full-scale attack against Kavanaugh as they try to sway the one or two Republicans needed to sink President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE’s pick and score a major victory heading into the midterm elections.

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In the roughly two weeks since Kavanaugh was announced as Trump’s pick to replace Justice Anthony Kennedy, Democrats have jumped from abortion and the Affordable Care Act to what his past writings on executive authority could mean for special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s probe into potential collusion between the Trump campaign and Russia.

Sen. Dick Durbin Richard (Dick) Joseph DurbinFeinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Grand jury charges no officers in Breonna Taylor death Democrats shoot down talk of expanding Supreme Court MORE (D-Ill.) acknowledged that while he believes their tactics are reverberating with the American public, Republican senators are a “smaller audience.”

“Well, it’s an unfolding script here,” he told The Hill. “Health care was obvious because it’s timely, but the more we dig into statements made by Judge Kavanaugh, he’s raised a lot of issues. I can’t tell you which one is going to stick at this point.”

He added that while it’s a “little early” to determine what could win over Republicans, health care and Kavanaugh’s views on executive authority are “two powerful issues.”

Still, none of the Democratic attacks have gained much traction with Republicans.

GOP Sen. Susan Collins Susan Margaret CollinsClub for Growth to spend million in ads for Trump Supreme Court nominee Maryland's GOP governor says Republicans shouldn't rush SCOTUS vote before election The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November MORE (Maine) — viewed as a potential swing vote in the immediate aftermath of Kennedy’s retirement announcement — has sounded fairly positive about Kavanaugh’s credentials as she works through what she referred to as his “voluminous” record.

Collins says she doesn’t plan to ask Kavanaugh about his “personal views” on Roe v. Wade — the 1973 case that established the right to an abortion — but wants a Supreme Court justice to be able to put aside their personal views and make an “impartial” decision.

When asked if she had reviewed his writings on executive authority, she added that she is having meetings “virtually every day,” but declined to discuss specifics as she reviews his decades-long paper trail.

Collins and Sen. Lisa Murkowski Lisa Ann MurkowskiClub for Growth to spend million in ads for Trump Supreme Court nominee Pebble Mine CEO resigns over secretly recorded comments about government officials Maryland's GOP governor says Republicans shouldn't rush SCOTUS vote before election MORE (R-Alaska) have been targeted heavily by progressive groups because of their previous breaks with their party on health care, namely their opposition to last year’s GOP plan to repeal ObamaCare and their votes against legislation that would ban most abortions after 20 weeks.

“There is a rigorous campaign underway right now in Maine. There’s like a $3 million media buy, which is huge in my state,” Collins said. “So you can’t turn on the television or the radio or go on the internet without seeing ads. But those kinds of things are not going to have an influence on my vote.”

In addition to health care and abortion, where Democrats warn Kavanaugh could be a swing vote on the bench, they’ve increasingly hammered him over his skepticism of the Supreme Court’s 1974 ruling in U.S. v. Nixon, which required President Nixon to turn over his tape recordings.

In 1999, Kavanaugh questioned if the case had been “wrongly decided” and if “tensions of the time led to an erroneous decision.” His comments were turned over to the Senate Judiciary Committee as part of his questionnaire response.

“If Kavanaugh would’ve let Nixon off the hook, what is he willing to do for President Trump?” Senate Minority Leader Charles Schumer Chuck SchumerCruz blocks amended resolution honoring Ginsburg over language about her dying wish Senate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' MORE (D-N.Y.) asked from the Senate floor.

But top GOP senators have brushed aside Democratic concerns and accused them of cherry-picking quotes from Kavanaugh, who has also defended the decades-old Supreme Court ruling.

Sen. John Cornyn John CornynThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight Senate GOP faces pivotal moment on pick for Supreme Court MORE (R-Texas) said Kavanaugh’s comments just “sounded like a law professor.”

Meanwhile, Sen. Rand Paul Randal (Rand) Howard PaulRand Paul says he can't judge 'guilt or innocence' in Breonna Taylor case Overnight Health Care: Health officials tell public to trust in science | Despair at CDC under Trump influence | A new vaccine phase 3 trial starts Health officials tell public to trust in science MORE (R-Ky.), another potential swing vote, met with Kavanaugh on Tuesday for roughly an hour after describing himself as “honestly undecided.”

Paul’s skepticism about Kavanaugh boils down to his positions on the Fourth Amendment, which established the constitutional right to privacy.

Paul’s libertarian-minded views have, at times, rankled his colleagues, and those views position him as a potential foil to GOP leadership plans.

But the GOP senator would face a mountain of pressure from his Republican colleagues and the administration to back Kavanaugh. And top senators in both parties are skeptical that Paul, who has worked to build a relationship with Trump, would cast the deciding vote to sink his Supreme Court nominee.

Asked about the chances of Paul voting against Kavanaugh, Durbin chuckled.

“He’s a perennial tease, as are many other Republicans,” Durbin said. “They get a lot of press attention but rarely if ever will break from their party.”

The hunt for a message that could win over just a couple of GOP colleagues comes as Democrats are digging in on their demand for documents from Kavanaugh’s time in the George W. Bush White House, where he worked as legal counsel and as staff secretary.

So far, Republicans are dismissing the broad document demands, with Senate Judiciary Committee Chairman Chuck Grassley Charles (Chuck) Ernest GrassleyThe Hill's 12:30 Report: Ginsburg lies in repose Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy Read: Senate GOP's controversial Biden report MORE (R-Iowa) warning against the review becoming a “fishing expedition.”

“I want to see documents that he himself wrote,” Collins said on Tuesday. “It does not make sense to ask for those documents just because he touched them, initialed them.”

“There’s a difference between what he drafted versus the paper push,” she added.

Several top Democrats, including Schumer, are delaying meeting with Kavanaugh until they make progress on a documents deal.

But those tactics aren’t uniting the conference, and they have become another example of the difficulty Democrats face in remaining united against Kavanaugh.

Sens. Joe Manchin Joseph (Joe) ManchinManchin defends Supreme Court candidate Barrett: 'It's awful to bring in religion' The Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week Trump meets with potential Supreme Court pick Amy Coney Barrett at White House MORE (W.Va.) and Joe Donnelly Joseph (Joe) Simon DonnellyHarris faces pivotal moment with Supreme Court battle Trump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court MORE (Ind.) — Democrats running in states Trump won in 2016 — both announced this week that they had scheduled meetings with Kavanaugh.

When asked about his colleagues’ unwillingness to meet with Kavanaugh, Manchin blasted the tactic as “disrespectful.”

“That’s something that I would absolutely rail against,” Manchin said, adding that he thought it was “horrible when Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE wouldn’t meet and sit down” with Merrick Garland Merrick Brian GarlandPoll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' Chief justice honors Ginsburg: 'When she spoke, people listened' MORE, former President Obama’s nominee to replace the late Justice Antonin Scalia.

“That’s not a precedent that should be followed,” Manchin said.