WASHINGTON (AP) — President Donald Trump said Friday that he will nominate former Federal Reserve official Kevin Warsh to be the next chair of the Fed, a pick likely to result in sharp changes to the powerful agency that could bring it closer to the White House and reduce its longtime independence from day-to-day politics.

Warsh would replace current chair Jerome Powell when his term expires in May. Trump chose Powell to lead the Fed in 2017 but this year has relentlessly assailed him for not cutting interest rates quickly enough.

“I have known Kevin for a long period of time, and have no doubt that he will go down as one of the GREAT Fed Chairmen, maybe the best,” Trump posted on his Truth Social site. “On top of everything else, he is ‘central casting,’ and he will never let you down.”

The appointment, which requires Senate confirmation, amounts to a return trip for Warsh, 55, who was a member of the Fed’s board from 2006 to 2011. He was the youngest governor in history when he was appointed at age 35. He is currently a fellow at the right-leaning Hoover Institution and a lecturer at the Stanford Graduate School of Business.

In some ways, Warsh is an unlikely choice for the Republican president because he has long been a hawk in Fed parlance, or someone who typically supports higher interest rates to control inflation. Trump has said the Fed’s key rate should be as low as 1%, far below its current level of about 3.6%, a stance few economists endorse.

During his time as governor, Warsh objected to some of the low-interest rate policies that the Fed pursued during and after the 2008-09 Great Recession. He also often expressed concern at that time that inflation would soon accelerate, even though it remained at rock-bottom levels for many years after that recession ended.

But more recently, however, in speeches and opinion columns, Warsh has said he supports lower rates.

Warsh’s appointment would be a major step toward Trump’s asserting more control over the Fed, one of the few remaining independent federal agencies. While all presidents influence Fed policy through appointments, Trump’s rhetorical attacks on the central bank have raised concerns about its status as an independent institution.

Who is Warsh?

Prior to serving on the Fed’s board in 2006, Warsh was an economic aide in George W. Bush’s Republican administration and was an investment banker at Morgan Stanley.

Warsh worked closely with then-Chair Ben Bernanke in 2008-09 during the central bank’s efforts to combat the financial crisis and the Great Recession. Bernanke later wrote in his memoirs that Warsh was “one of my closest advisers and confidants” and added that his “political and markets savvy and many contacts on Wall Street would prove invaluable.”

Warsh, however, raised concerns in 2008, as the economy tumbled into a deep recession, that further interest rate cuts by the Fed could spur inflation. Yet even after the Fed cut its rate to nearly zero, inflation stayed low.

And he objected in meetings in 2011 to the Fed’s decision to purchase $600 billion of Treasury bonds, an effort to lower long-term interest rates, though he ultimately voted in favor of the decision at Bernanke’s behest.

In recent months, Warsh has become much more critical of the Fed, calling for “regime change” and assailing Powell for engaging on issues like climate change and diversity, equity and inclusion, which Warsh said are outside the Fed’s mandate.

His more critical approach suggests that if he does ascend to the position of chair, it could amount to a sharp transition at the Fed.

In a July interview on CNBC, Warsh said Fed policy “has been broken for quite a long time.”

“The central bank that sits there today is radically different than the central bank I joined in 2006,” he added. By allowing inflation to surge in 2021-22, the Fed “brought about the greatest mistake in macroeconomic policy in 45 years, that divided the country.”