Treasury Secretary Steven Mnuchin held calls on Sunday with the heads of the six largest U.S. banks to shore up confidence in the U.S. financial system amid the recent market turmoil.

"The banks all confirmed ample liquidity is available for lending to consumer and business markets," the Treasury Department said in a statement.

Mnuchin spoke with J.P. Morgan Chase CEO Jamie Dimon, Bank of America's Brian Moynihan, Goldman Sachs' David Solomon, Morgan Stanley's James Gorman, Tim Sloan of Wells Fargo and Michael Corbat of Citigroup.

"We continue to see strong economic growth in the U.S. economy with robust activity from consumers and business," Mnuchin said in the statement.

Today I convened individual calls with the CEOs of the nation's six largest banks. See attached statement. pic.twitter.com/YzuSamMyeT — Steven Mnuchin (@stevenmnuchin1) December 23, 2018

Wells Fargo declined to comment on the calls. The other five banks did not immediately return CNBC's requests for comment.

Mnuchin is dealing with several issues facing investors and the financial system: