The most vulnerable Republican in the Senate is locked in a pitched battle with President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE over the future of Yucca Mountain, a massive nuclear waste repository located 90 miles outside Las Vegas.

It’s a political fight that is welcome in some ways for 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 (Nev.), the only GOP senator running for reelection this year in a state won in 2016 by Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE.

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In repeatedly confronting the Trump administration over its plans to reopen the facility, Heller has an opportunity to show off his political independence to home-state voters on an issue where the White House understands he’s sticking up for his state.

That’s key, too, because Heller is seeking to avoid being seen as one of Trump’s GOP critics, a designation that could also hurt his chances come November.

“Heller needs to show he’s been an effective senator,” said Jon Ralston, a prominent Nevada-based political commentator and editor of The Nevada Independent. “This will be a ready-made TV commercial or mail piece for him: ‘I’ve stopped Yucca Mountain.’”

Ralston, a veteran of Nevada politics, predicts Trump backers won’t punish Heller for opposing the president on Yucca Mountain.

“Trump supporters in Nevada don’t care about Yucca Mountain,” he said.

Heller is keen to talk about his efforts to thwart Trump on Yucca.

He says he’s beat back efforts by the administration to add $120 million in the year-end spending packages for fiscal 2017 and 2018 to restart that licensing process for the facility shuttered in 2011 by President Obama and then-Senate Majority Leader Harry Reid Harry Mason ReidThe Supreme Court vacancy — yet another congressional food fight Trump seeks to turn around campaign with Supreme Court fight On The Trail: Battle over Ginsburg replacement threatens to break Senate MORE (D-Nev.).

“They put it in ‘17, I took it out. They put it in ‘18, I took it out,” Heller told The Hill.

“They keep putting it in the budget. The House approves it. It comes over here and I take it out,” he added. “I tell them every year, ‘You do that, I’m going to take it out.’”

Heller confronted Energy Secretary Rick Perry Rick PerryEnergy secretary questions consensus that humans cause climate change OVERNIGHT ENERGY: Democrats push resolution to battle climate change, sluggish economy and racial injustice | Senators reach compromise on greenhouse gas amendment stalling energy bill | Trump courts Florida voters with offshore drilling moratorium OVERNIGHT ENERGY: Trump signs major conservation bill into law | Senate votes to confirm Energy's No. 2 official | Trump Jr. expresses opposition to Pebble Mine project MORE over the issue at a hearing in March, asking whether the administration would try to secure funding for licensing the repository in the fiscal 2019 spending package.

Perry said he would but acknowledged “the result will probably be about the same” because of the Nevada senator’s opposition.

Heller also grilled White House budget director Mick Mulvaney Mick MulvaneyMick Mulvaney to start hedge fund Fauci says positive White House task force reports don't always match what he hears on the ground Bottom line MORE at a hearing last month.

Mulvaney said he would be open to finding alternative solutions for storing tens of thousands of metric tons of nuclear waste after Heller slammed Yucca Mountain as an “unsafe, ill-conceived proposal.”

“I will take it out,” Heller warned Mulvaney if he attempted to secure money for licensing in 2019.

Heller needs to illustrate his independence from Trump on some issues as he seeks to walk a tightrope to a third term in what is considered a toss-up race. Polls show him neck-and-neck with his likely Democratic challenger, Rep. Jacky Rosen Jacklyn (Jacky) Sheryl RosenHillicon Valley: Election officials prepare for new Russian interference battle | 'Markeyverse' of online fans helps take down a Kennedy | GOP senators unveil bill to update tech liability protections Google, Apple, eBay to meet virtually with lawmakers for tech group's annual fly-in Senate Democrats demand answers on migrant child trafficking during pandemic MORE (Nev.).

The Republican voted for legislation to repeal and replace ObamaCare as well as the tax-cut law, which Democrats are likely to use against him.

The ObamaCare vote in particular could be a problem given opposition to it from Nevada’s Republican governor, Brian Sandoval. He warned it would threaten health coverage for millions of middle-class families and shift Medicaid costs to states.

“Here there’s been a concern that he’s caved in to Trump and the Trump administration,” said John Tuman, chairman of the political science department at the University of Nevada, Las Vegas. “The health-care vote is one that’s seen as being potentially damaging to him here.”

Tuman said Heller is also at risk of losing ground with Hispanic voters, who made up 17 percent of Nevada’s electorate at the start of 2016, because of Trump’s divisive comments about illegal immigrants.

“The immigration issue, I think, has not been helpful,” he said. “He’s had a hard time in meeting with stakeholders creating the impression that somehow he’s pushing back or trying to be the voice of moderation on immigration.”

Heller decided early on to stick with Trump on high-profile national policy issues after seeing first-hand the risks of disavowing Trump.

Former Rep. Joe Heck Joseph (Joe) John HeckCreating a more secure nation means public service hiring practices need an overhaul During this historic time, remember to value public service Creating a more resilient nation in times of crisis MORE (R-Nev.) lost his Senate race in 2016 to Democrat Catherine Cortez Masto Catherine Marie Cortez MastoDemocratic Senate campaign arm raised nearly M in August VA problems raise worries about mail slowdown, prescriptions Cortez Masto touts mail-in voting in convention speech MORE after calling on Trump to step down as the GOP presidential nominee.

On Yucca, Heller has an active issue on which to show he is fighting for Nevada.

Trump is still seeking $47.7 billion in his budget request for fiscal 2019 to restart the licensing process for Yucca Mountain, according to Senate sources.

Heller has taken on GOP colleagues in the Senate over the issue, too.

Sen. Lamar Alexander Andrew (Lamar) Lamar AlexanderGraham: GOP has votes to confirm Trump's Supreme Court nominee before the election The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy This week: Supreme Court fight over Ginsburg's seat upends Congress's agenda MORE (R-Tenn.), the chairman of the Senate Appropriations Subcommittee on Energy and Water Development, endorsed the administration’s request to restart the licensing process during a hearing last week.

“I strongly believe that Yucca Mountain can and should be part of the solution to the nuclear waste stalemate,” he said.

Alexander noted that federal law designates Yucca Mountain as a national repository for spent nuclear fuel and argued that Nuclear Regulatory Commission scientists believe it can be stored there for up to a million years.

Heller immediately pushed back in a sternly worded letter to Alexander and Sen. Dianne Feinstein Dianne Emiel FeinsteinBiden leads Trump by 12 points among Catholic voters: poll Names to watch as Trump picks Ginsburg replacement on Supreme Court McConnell says Trump nominee to replace Ginsburg will get Senate vote MORE (Calif.), the ranking Democrat on the Energy and Water panel, calling the project a “breach of state sovereignty.”

“The Yucca Mountain proposal poses significant health and safety risks and potentially catastrophic financial risks that must be addressed before — and not after – the proposal moves forward should it move forward at all,” he wrote.

Heller is likely to argue that he’ll be more effective in fighting Yucca going forward than Rosen would be.

“Jacky Rosen, if she were to get elected, is going to be a back-bencher freshman,” Ralston said. “I just don’t see that being a factor at all in stopping Yucca Mountain.”

The prospect of shipping highly radioactive waste from around the country to a mountain within 100 miles of the Las Vegas strip has the state’s tourism industry up in arms, says Tuman, of UNLV.

“There’s a great deal of concern about this would mean for the tourism sector,” he said. “Even among some who are a little more conservative economically, this is not something they want in their backyard.”

Ralston wonders whether, in the Trump era, Nevada voters will care about Yucca Mountain as much as they have in the past.

“Heller will get some mileage out of it, but the question is how much is Yucca Mountain a voting issue for anybody anymore?” he asked.