Congressional Republicans don't want to talk about attacks on ObamaCare. But 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 isn't making that easy.

The Trump administration on Wednesday filed its official legal argument calling for the entirety of the Affordable Care Act to be struck down, once again thrusting the issue back in the spotlight at a time when GOP lawmakers are trying to turn the page.

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Republicans would much rather focus on criticizing the “Medicare for All” proposal backed by more and more Democrats, something they see as a winning line of attack compared to reigniting an ObamaCare debate that contributed to the GOP losing its majority in the House last year.

Trump, though, is not playing along with that strategy; instead, he is keeping up his attacks on ObamaCare in court and in his speeches.

Asked if he wished the Trump administration were not arguing so forcefully against the 2010 health care law in court, Sen. John Thune John Randolph ThuneOvernight Defense: Stopgap spending measure awaits Senate vote | Trump nominates former Nunes aide for intelligence community watchdog | Trump extends ban on racial discrimination training to contractors, military Remote work poses state tax challenges Senate GOP sees early Supreme Court vote as political booster shot MORE (S.D.), the No. 2 Senate Republican, separated congressional Republicans from the White House.

“They're going to do what they're going to do,” Thune said. “What we have to worry about is what our members are working on, what we're trying to do and how we're communicating that to the American people.”

Sen. 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), chairman of the Senate Finance Committee, declined to say he supported the administration’s move.

“The president can message whatever he wants to message, and there's no control I have over what he can message,” Grassley said.

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And Republicans have been beating the drum almost daily to get across their main health care message: that Medicare for All would take away people’s private health insurance and come with an enormous price tag.

Republicans this week seized on a new report from the nonpartisan Congressional Budget Office examining projected costs associated with Medicare for All. While the report did not put a specific price tag on the proposal, it said government spending on health care would "increase substantially."

Previous studies have put the cost to the government around $32 trillion over 10 years.

But one side effect of the GOP’s attacks on Medicare for All is that it comes close to defending the status quo, which includes ObamaCare.

Rep. Tom Cole Thomas (Tom) Jeffrey ColeBottom line House approves .3 trillion spending package for 2021 Multiple lawmakers self-quarantine after exposure to Gohmert MORE (R-Okla.) asked at a hearing this week on Medicare for All why lawmakers don’t just focus on bipartisan fixes to ObamaCare instead of pursuing the sweeping new system that’s championed by progressives like 2020 presidential candidate Sen. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.).

“We have a chance, I think, to make some fixes that we probably all agree on,” Cole said.

Over the past few months, though, GOP lawmakers had been mostly silent on ObamaCare, a law they aggressively attacked for eight years.

The Affordable Care Act’s popularity has been rising in recent years, with a Kaiser Family Foundation poll in April finding that 50 percent of adults have a favorable view of the law, compared to 38 percent with an unfavorable one.

Most Democrats last year campaigned on maintaining the law’s popular protections for people with pre-existing conditions.

“The last thing Senate Republicans want to be doing is participating in an exercise that would potentially remove coverage from people with pre-existing conditions that they already have,” said a Senate GOP strategist. “Candidates in tough races will be emphasizing how to improve on what currently exists.”

Senate Majority Leader 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 (R-Ky.) last month said the GOP health care message is “preserving what works and fixing what doesn't,” a very different slogan than the party’s long-time mantra of “repeal and replace.”

Trump, though, is on the attack against ObamaCare. In a speech last week, he touted the 2017 repeal of the law’s mandate to have coverage before adding, “Now we’re going for the rest.”

His administration is also supporting the lawsuit brought by a coalition of GOP-led states calling for overturning the law. That case, which legal experts in both parties dismiss as unlikely to succeed, is now making its way through the 5th Circuit Court of Appeals.

Vulnerable Republican lawmakers are not eager to talk about the administration’s efforts on that front.

Sen. Cory Gardner Cory Scott GardnerCook Political Report shifts Colorado Senate race toward Democrat Overnight Health Care: US coronavirus deaths hit 200,000 | Ginsburg's death puts future of ObamaCare at risk | Federal panel delays vote on initial COVID-19 vaccine distribution The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting MORE (R-Colo.), perhaps the most vulnerable GOP senator up for reelection next year, said Thursday that he had not seen the administration’s legal filing, declining to comment on it and on his views on the lawsuit. His office did not respond to a follow-up inquiry.

Rep. John Katko John Michael KatkoThis week: House returns for pre-election sprint Hillicon Valley: Simulated cyberattack success | New bill for election security funding | Amazon could be liable for defective products Lawmakers introduce bill to help election officials address cyber vulnerabilities MORE (R-N.Y.), a moderate who is facing a potentially competitive race next year, distanced himself from the lawsuit.

“I don't agree with anything being taken out without a replacement ready,” he said.

Sen. Shelley Moore Capito Shelley Wellons Moore CapitoCongress must finish work on popular conservation bill before time runs out Second GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure MORE (R-W.Va.) noted the failure of the GOP’s repeal attempt in 2017.

“Obviously the repeal-and-replace discussion wasn't successful, so let's put that behind us and let's make this one work,” she said.

Thune, though, suggested that if Republicans were in control of both chambers again, they would likely attempt another repeal-and-replace measure.

“Obviously, if and when we have the votes, we'd like to take a different direction, one that would create more competition and more choices and lower costs,” Thune said.