By Francesco Canepa and Balazs Koranyi

SINTRA, Portugal (Reuters) -At their annual gathering in the hills of Portugal’s Sintra, central bankers this week confronted rising challenges to their control of the global money system, from political attacks on the U.S. Federal Reserve to the rise of stablecoins.

Recent editions of the European Central Bank’s getaway event have been dominated by worries about high inflation – no surprise after central banks whose core task is price stability were mostly late to react to a surge in prices in 2021-22.

But this year’s discussions – from choreographed panel debates among central bank chiefs to late-night exchanges at the hotel bar – were centred on more existential threats to the monetary system as we know it.

U.S. President Donald Trump’s frequent, often personal, attacks on Federal Reserve chair Jerome Powell – and hints about his replacement – were the most obvious example.

Any suggestion that the Fed might bow to pressure from the White House to lower borrowing costs would hurt its reputation for independence – for decades a core tenet of central banking seen crucial for keeping policy credible and investors on-side.

Two in three reserve managers at central banks polled by UBS Asset Management said in a survey released this week they feared that Federal Reserve independence was at risk.

Powell batted away such worries during a panel discussion, saying he and colleagues were focused “100%” on low inflation and full employment “in a completely non-political way”.

He drew applause from an audience of economists and central bankers, with ECB President Christine Lagarde saying she and her peers would do the same if they were in Powell’s shoes.

CONFIDENCE DENTED

But confidence has already been shaken.

Central bankers were openly fretting about a topic that was taboo only a few months ago: will the Fed, even under a Trump-picked chair next year, continue to lend dollars to foreign banks when they are in trouble?

Commercial lenders outside the United States have been able to borrow dollars even when they are shut out of financial markets via swap lines between the Fed and some other central banks created during the 2008 global financial crisis.

These facilities underpin the $25-trillion market for dollar credit outside the United States and also serve a domestic purpose: by helping to douse financial fires abroad, they effectively prevent them from spreading to Wall Street.

The Trump administration’s retreat from international coordination has raised some concerns about these lifelines, even though there has been no action so far to suggest they will be cut.

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