GOP Sens. Lisa Murkowski Lisa Ann MurkowskiOVERNIGHT ENERGY: House passes sweeping clean energy bill | Pebble Mine CEO resigns over secretly recorded comments about government officials | Corporations roll out climate goals amid growing pressure to deliver The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Abortion stirs GOP tensions in Supreme Court fight MORE (Alaska) and Susan Collins Susan Margaret CollinsThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Billionaire who donated to Trump in 2016 donates to Biden Credit union group to spend million on Senate, House races MORE (Maine), seen as potential swing votes on President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE’s Supreme Court nominee, are facing intense pressure from activists during their August recess.

The two moderate GOP senators could make or break whether or not Brett Kavanaugh gets confirmed, and, despite badgering from reporters around the Capitol, they’ve offered few hints about where they will come down on Trump’s nominee.

“Susan Collins and Lisa Murkowski … those are the most important Republicans,” said Brad Woodhouse, the executive director of Protect Our Care. “I have every reason to believe that if Lisa Murkowski and Susan Collins came out against this nomination, there would be a majority to oppose [him].”

With Republicans holding a fragile 51-seat majority, Democrats can’t block Kavanaugh on their own. Their strategy depends on keeping their own caucus — including several senators vulnerable in November — undeclared long enough for public pressure to sway either Collins or Murkowski to vote against him.

It’s a game plan that’s failed them on recent high-stakes nomination fights, including Mike Pompeo Michael (Mike) Richard PompeoPutin nominated for Nobel Peace Prize The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Pompeo accused of stumping for Trump ahead of election MORE to be secretary of State and Gina Haspel to lead the CIA.

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But progressives are hoping that by focusing on pre-existing conditions or the potential that Kavanaugh could vote to overturn Roe v. Wade, they’ll repeat last year’s playbook, which allowed them to block the repeal of ObamaCare.

“We've definitely gotten some [calls] on both sides,” a spokeswoman for Murkowski told The Hill on Tuesday about outreach to the GOP senator’s D.C. office. She added that Murkowski did a tele-town hall with constituents last week and the nomination “did come up with a couple of the callers.”

Neither Collins nor Murkowski’s office have publicly quantified the level of constituent outreach they’re getting over Kavanaugh. But the two recently told The Washington Post that their constituents viewed the nomination fight differently from that on the Affordable Care Act (ACA), with Collins saying she had received less outreach over the court battle.

But outside groups want to use the Senate’s roughly two-week recess to change that. They argue the break — where senators will be back in their home states for the longest period of time since early April — gives voters a chance buttonhole the two senators in person and is “crucial” to making sure they feel pressure to oppose Kavanaugh.

“I feel like what our job is to do is to make sure that every one of those people has the opportunity to talk to their senator as they come home for recess,” said Kelley Robinson, the national organizing director for Planned Parenthood Action Fund.

Planned Parenthood supporters are taking part in more than 100 separate actions on the high court over the recess, including voter education, letter writing and phone banking to target key senators, including Collins and Murkowski. Meanwhile, Protect Our Care is launching new TV and radio ads in Maine, Alaska and Nevada.

Collins and Murkowski aren’t the only Republicans on whom progressives are focused. Other targets include Tennessee and Arizona — the respective homes of GOP Sens. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE and Jeff Flake Jeffrey (Jeff) Lane FlakeHow fast population growth made Arizona a swing state Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden MORE, both vocal Trump critics — as well as Nevada, where Sen. Dean Heller Dean Arthur HellerOn The Trail: Democrats plan to hammer Trump on Social Security, Medicare Lobbying World Democrats spend big to put Senate in play MORE is the only Republican senator running for reelection in a state won by Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE.

But Collins and Murkowski are viewed as the Republicans most likely to flip after they broke with their party on other high-profile fights, including the nomination of Education Secretary Betsy DeVos Elizabeth (Betsy) Dee DeVosSpecial counsel investigating DeVos for potential Hatch Act violation: report NEA president says Azar and DeVos should resign over school reopening guidance The Hill's 12:30 Report - Presented by Facebook - You might want to download TikTok now MORE and a bill to ban most abortions after 20 weeks — in addition to ObamaCare repeal.

So far they’ve refused to be pinned down on Kavanaugh and offered few hints that attacks from either side have impacted their thinking.

Collins, who has had near daily meetings on the Supreme Court, said she plans to ask Kavanaugh about health care and executive authority, two issues important to Democrats. She also warned that those who were assuming she’s an automatic "yes" are wrong.

“I never reach a conclusion until after I’ve had the one-on-one sit down meeting and also the hearings have been held. You never know what’s going to happen at a hearing,” Collins told reporters before the Senate left town for the recess.

Asked about the argument that Kavanaugh could throw out ACA as a whole or its protections for pre-existing conditions, Murkowski said separately that she wasn’t “convinced that he's going to throw out or retain anything absolutely.”

“I don't want to be in a situation where I'm going to say 'I'm not going to vote for you unless you promise me you're going to rule this way,' ” she added. “That's not a good process.”

Progressives aren’t the only ones targeting the two senators, neither of whom have yet met with Kavanaugh.

The National Rifle Association Institute for Legislative Action announced on Tuesday that it had launched a seven-figure ad campaign urging support for Kavanaugh. In addition to a national TV spot, the group is rolling out regional ads in five states: Alabama, Alaska, Indiana, North Dakota and West Virginia. Murkowski’s state is the only one on that list that doesn’t have a red-state Democrat up for reelection.

The renewed effort to sway Collins and Murkowski comes as the bulk of the day-to-day media coverage, as well as the rhetorical firefight, has been focused on the weeks-long battle over which documents to request from Kavanaugh’s decades-long paper trail.

Democrats want the National Archives to hand over documents tied to his three years as staff secretary for President George W. Bush, arguing it could help shed light on his thinking on issues such as torture or surveillance.

But the Archives has rebuffed their request for the documents and, because they’re in the minority, Democrats are powerless to force Republicans to request the documents.

Democrats, who argue Republicans are trying to hide something in Kavanaugh’s record, are hoping that public backlash to the GOP tactics will force them to reverse course.

The narrow GOP majority also gives any one Republican senator the leverage to demand more documents before the nomination can move forward.

But, so far, Collins and Murkowski have dismissed the Democrats’ document demands as “excessive,” signaling they won’t help use procedural tactics to force GOP leadership to request more from Kavanaugh’s time in the White House.

Collins told reporters before the Senate left town for its truncated recess that she believed the current GOP documents request is “eminently reasonable.”

Murkowski added that the documents being turned over for Kavanaugh, which senators estimate could top 1 million pages, are “really quite unprecedented.”

“For the request to go so far as to include anything where his name is even mentioned, anything that would have his name as being one that is cc'd or that is passed through, it just seems to me that the request really does border on the excessive,” she said. “It would be one thing if he had no history of any writings but that is not the case.”

—Alexander Bolton contributed.