(NEW YORK) — The Federal Reserve is weathering a political “stress test” that threatens to undermine public trust in the central bank and damage the United States economy, former Fed Chair Jerome Powell said in recent remarks.

“Like many other institutions, the Fed has been undergoing a stress test,” Powell told an audience at the John F. Kennedy Library Foundation in Boston on Sunday, adding that “Congress wisely chose to insulate monetary policy decisions from political pressure. All other advanced-economy nations have done the same.”

The remarks amounted to a spirited defense of Fed independence, coming just weeks after Powell stepped down from his role as head of the central bank. Powell remains on the Federal Reserve’s 12-person board of governors.

At the outset of this year, the Department of Justice opened a criminal investigation into Powell centered on his testimony to Congress about the cost overruns in a building renovation. It was the first criminal probe of a Fed chair in the central bank’s 113-year history.

Powell denied any wrongdoing and condemned the investigation as an effort to influence Fed policy. President Donald Trump, who has repeatedly criticized Powell’s approach to interest-rate policy, denied any involvement in the criminal investigation.

The Supreme Court, meanwhile, is set to issue a decision in the coming weeks in a high-stakes legal fight focused on Trump’s attempted ouster of Fed Governor Lisa Cook over alleged mortgage fraud.

Federal law allows the president to remove a member of the Fed board “for cause,” but little precedent exists for such a removal. Cook rejected the charges as baseless, calling them politically motivated.

In his recent remarks, Powell defended legal protections for Fed officials as critical safeguards for the nation’s economy.

“If any administration finds a way to remove Fed officials over policy differences, then future administrations will do so as well. The public would lose faith that the central bank will make decisions based on only what’s best for all Americans. The Fed’s credibility would be lost,” Powell said.

“That credibility enables the Fed to support a strong and stable economy for the benefit of American families and businesses,” Powell added.

The warning comes as the Fed weathers a renewed bout of inflation set off by a historic oil shock amid the Iran war. The conditions offer an initial test for Fed Chair Kevin Warsh, who took the helm of the central bank last month.

If the Fed were to lose its independence, central bankers beholden to political leaders may favor lower interest rates as a means of boosting short-term economic activity and galvanizing public support, some analysts previously told ABC News. But, they added, that posture poses a major risk in the possibility of years-long inflation fueled by a rise in consumer demand, untethered by interest rates.

A burst of high inflation in the 1970s and 1980s offers a cautionary tale.

Before inflation took hold, President Richard Nixon had urged then-Fed Chair Arthur Burns to cut rates in the run-up to the 1972 presidential election. Nixon’s advocacy is widely viewed as contributing to lower-than-necessary interest rates that allowed inflation to get out of control.

Nearly a decade later, in 1981, the Fed raised interest rates as high as 20% in order to bring inflation under control. While the move succeeded in cooling off price hikes, it plunged the U.S. into a recession and sent the unemployment rate to 10%.

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(NEW YORK) — An American cruise ship passenger who has been quarantining at a Nebraska facility after being exposed to hantavirus said he plans to remain there for the full 42 days.

Jake Rosmarin, who is from Boston, has been at Nebraska’s National Quarantine Unit since May 11. He said staying the full six weeks is the best way to keep his loved ones safe.

“I have been traumatized by this whole experience. I’m afraid to leave this room until I know that the chance of me getting sick is 0%,” he told ABC News. “I want to know when I leave that the chances of me risking other people, my family, friends, the general public, I want know that my risk isn’t minimal. I want that also to be 0%.”

Not all of the 18 Americans who were sent to the facility are staying the full 42 days, which was recommended by health officials.

The incubation period — or the time that passes between exposure and when the first symptoms appear — for the Andes strain of hantavirus, which is believed to be behind the cruise ship cluster, is 42 days.

After the mandatory 21-day quarantine period, many have returned home to self-quarantine for the next 21 days, Rosmarin said. It’s unclear how many left and how many are staying.

On Friday, the New York State Department of Health said two New Yorkers who were quarantining in Nebraska are returning to the state this week.

The two people will be transported via non-commercial flights and complete the remainder of their 42-day monitoring period in residences located out of New York City.

The health department said the individuals have agreed to remain at home and avoid contact with other people. Plans are in place in the event the two people develop symptoms, health officials said.

Rosmarin — who had been traveling by himself — said he wanted to stay in Nebraska because those quarantining at the facility have quick access to medical care and testing, the latter of which is twice a week.

“Once you go home, you’re not gonna be able to be tested,” he said. “So, if you start getting sick, like you may not find out right away and you might not be able to get that care as quickly as possible.”

Rosmarin said he has tried to establish a routine during his time in quarantine, which includes getting up between 6:30 a.m. and 7:30 a.m. and exercising on a stationary bike.

He said he passes the time by completing puzzles, putting together Lego sets and crocheting.

“I have a calendar where I cross off the days going down,” Rosmarin said. “I watch new TV shows, new movies. I started a book and, honestly, the days have been flying by. The fact that it’s already been 21 days is kind of crazy to me.”

As of May 27, the World Health Organization said the total number of hantavirus cases remains at 13 and all linked back to the MV Hondius cruise ship.

Additionally, the number of deaths remains at three, including a married Dutch couple and a female German national.

“Given the long incubation period of up to six weeks, it is not unexpected that cases continue to be reported until the end of the six weeks since last exposure,” the WHO wrote in a bulletin last week.

ABC News’ Greg Romero contributed to this report.

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