Federal Reserve Chairwoman Janet Yellen on Tuesday swatted down suggestions from both sides of the aisle that it’s time for the central bank to change how it does business.

Appearing before the Senate Banking Committee, Yellen was on the defensive, as Republicans questioned how the Fed conducts monetary policy and Democrats put forward ideas for getting tougher on Wall Street.

In the midst of all of it, Yellen generally argued the Fed was designed as an independent entity for a reason — and it would be best not to change it.

“Central bank independence in conducting monetary policy is considered a best practice for central banks around the world,” she said. “Academic studies, I think, establish beyond the shadow of a doubt that independent central banks perform better.”

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The biggest challenge to the Fed’s structure is the growing movement to Audit the Fed via legislation from Sen. Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (R-Ky.) that would subject the central bank's monetary policy decisions to external review.

A GOP-controlled Congress has given the bill its best chances yet of passage, and that renewed interest led Yellen to deliver her most spirited opposition yet.

“I want to be completely clear,” she said. “I strongly oppose Audit the Fed.”

Yellen argued the audit measure would allow politicians to second-guess the Fed’s decisions, which, in turn, would weaken the central bank. And the ultimate victim of that process, she said, would be the U.S. economy.

The Fed chairwoman went so far as to wave a thick report before lawmakers as a way to highlight that most of the Fed's operations are already subject to outside audit.

There were signs Tuesday that the audit bill might have trouble making it through the Senate, even though the House has passed similar legislation twice.

Sen. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.) criticized the bill, calling it “an attempt to allow Congress to be able to put pressure on Fed members.”

“That would not be a particularly good idea, and it would cause us to put off tough decisions for the future,” he added.

If another GOP member of the Banking Committee joined Corker in opposing the bill, the measure would not be able to clear committee, assuming Democrats are united in opposing it.

That seems likely, as even liberal lawmakers critical of the Fed, including Sen. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.), have said they oppose the audit bill.

But even if the audit push is stalling, lawmakers have plenty of other ideas for how the Fed’s operations could be changed.

To open the hearing, committee Chairman Richard Shelby (R-Ala.) ran four different reform ideas past Yellen.

He suggested another way for the Fed to monitor inflation. Yellen says inflation remains low, giving it a reason not to hike interest rates yet.

“I don’t think it would make a lot of sense,” she said of the idea.

Shelby then wondered whether the Fed should establish an explicit rule to guide its monetary policy.

Yellen said that would amount to “chaining” the Fed down in setting the policy.

He also suggested rotating the vice chairmanship of the Fed, which is now permanently based at the New York bank.

Yellen said the current structure has “worked very well,” and New York is home to a unique number of experts fit for the job.

When Shelby asked if the Fed’s 12 districts could be consolidated to five, the Fed chairwoman said Congress set up the map a century ago and probably had good reason for doing so.

Despite Yellen’s protests, Shelby’s panel is likely to take up legislation that would rework the central bank. The chairman opened the hearing by saying there is more of a need now than ever for closer scrutiny by lawmakers.

“The role of Congress is not to serve on the Federal Open Market Committee. But, it is to provide strong oversight and, when times demand it, bring about structural reforms,” Shelby said.

One day before Yellen testified, the Alabama Republican announced that the panel would hold a March 3 hearing on reforming the Fed.

Yellen also has to navigate challenges from Democrats who want to see the bank operate differently.

Sen. Jack Reed John (Jack) Francis ReedWhen 'Buy American' and common sense collide Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election Top Democrats press Trump to sanction Russian individuals over 2020 election interference efforts MORE (D-R.I.) recently introduced a bill that would require the Senate to confirm the head of the New York Fed, which plays a central role in overseeing the nation’s largest financial institutions.

And Sen. Elizabeth Warren (D-Mass.) pushed Yellen on whether members of her staff — particularly General Counsel Scott Alvarez — are truly committed to implementing tough rules for the financial sector.

Warren highlighted some comments from Alvarez criticizing some provisions of the Dodd-Frank financial reform law and pushed Yellen to tighten the ship.

“The Fed’s general counsel or anyone at the Fed’s staff should not be picking and choosing which rules to enforce based on their personal views,” Warren said. “I urge you to carefully review this issue and to assess whether the leadership of the Fed’s staff is on the same page as the Federal Reserve Board.”

— Last updated at 2:35 p.m.