The president asked on Twitter 'who is our bigger enemy, Jay Powel or Chairman Xi?'

WASHINGTON — President Donald Trump launched a furious and highly personal Twitter attack Friday against the Federal Reserve and chairman Jerome Powell, fuming that the Fed "did NOTHING!" and wondering who is "our bigger enemy" — Powell or China's leader.

The outburst came after Powell, speaking to central bankers in Jackson Hole, Wyoming, gave vague assurances that the Fed "will act as appropriate" to sustain the nation's economic expansion.

While the phrasing was widely seen as meaning interest rate cuts, he offered no hint of whether or how many reductions might be coming the rest of the year.

Powell had barely finished speaking before Trump escalated his criticism of the Fed, which he has repeatedly accused of keeping rates too high. For months, the president has in particular ridiculed Powell, who was his own choice to lead the Fed, an independent agency.

"As usual, the Fed did NOTHING!" Trump tweeted, adding, "We have a very strong dollar and a very weak Fed." He went further by saying: "My only question is, who is our bigger enemy, Jay Powel (sic) or Chairman Xi?" — a reference to China's President Xi Jinping.

"My only question is, who is our bigger enemy, Jay Powel or Chairman Xi?," the president added, referring to China's leader. Trump has incorrectly referred to Jerome Powell as Jay repeatedly.

That remark appeared to elevate his attacks on the Fed to a new level. Many economists have expressed growing alarm about the president's criticism of the Fed as an intrusion on its independence and a threat to its credibility.

David Jones, a leading historian of the Federal Reserve, said the "enemy" remark set an unfortunate precedent.

"This challenges something that has been sacred in the history of the world's most successful central bank," said Jones, an economist and author of four books on the Fed. "The central banks that have been successful are those which are independent of political pressures and were free to make the appropriate monetary policy."

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Powell's speech came on a day of fast-moving events in the financial world and a sharp escalation in the trade dispute with China that threatens to tip a weakening global economy into recession.

China announced earlier in the day that it will impose new tariffs on $75 billion of U.S. products in retaliation for Trump's latest planned round of import duties.

Trump promptly reacted by declaring on Twitter that he had "hereby ordered" American companies with operations in China "to immediately start looking for" other places in which to do business.

"Our Country has lost, stupidly, Trillions of Dollars with China over many years," he said. "They have stolen our Intellectual Property at a rate of Hundreds of Billions of Dollars a year, & they want to continue. I won't let that happen!"

"Our Country has lost, stupidly, Trillions of Dollars with China over many years. They have stolen our Intellectual Property at a rate of Hundreds of Billions of Dollars a year, & they want to continue. I won't let that happen!"

Markets in the U.S., Asia and Europe tumbled. The White House offered no further details or explanation of Trump's intentions.

In his speech in Jackson Hole, Powell said Trump's trade wars have complicated the Fed's ability to set interest rates and have contributed to a global economic slowdown.

Last month, the Fed cut rates for the first time in a decade, and financial markets appear to be expecting more cuts this year. Trump has argued that a full percentage-point reduction in the coming months would be appropriate — a step most economists consider excessive.

The president contends that lower rates in other countries have caused the dollar to rise in value and thereby hurt U.S. export sales. Earlier in the week, he told reporters, "If the Fed would do its job, you would see a burst of growth like you have never seen before."

Powell has said that the White House criticism has had no effect on the Fed's deliberations over interest rate policy.

Trump has insisted in the past that he could fire Powell if he wanted to — an assertion that most experts regard as dubious at best. No Fed chairman has ever been removed by a president.