Washington (CNN) In a precautionary move, Treasury Secretary Steven Mnuchin spent Sunday on the phone speaking with the chief executives of six of the country's largest banks to avoid yet another market whiplash when Wall Street opens Monday.

The secretary, who has been visiting his children in Cabo San Lucas, Mexico, tried to get ahead of further market jitters following reports that President Donald Trump was consulting advisers about whether he had the legal authority to fire Federal Reserve Chairman Jerome Powell

In a series of calls with CEOs, Mnuchin spoke with Jamie Dimon of J.P. Morgan Chase, Tim Sloan of Wells Fargo and David Solomon of Goldman Sachs. He also called James Gorman of Morgan Stanley, Brian Moynihan of Bank of America and Citi's Michael Corbat. Each of the executives said they have "ample liquidity" to lend to consumers, businesses and perform other market operations, the Treasury Department said in a statement Sunday evening.

"We continue to see strong economic growth in the U.S. economy with robust activity from consumers and business," Mnuchin said in a statement. He added, "With the government shutdown, Treasury will have critical employees to maintain its core operations at Fiscal Services, IRS, and other critical functions within the department."

The secretary said none of the financial institutions had experienced "any clearance or margin issues" and "markets continue to function properly."

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