President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE said traders selling stocks are making a "big mistake" on Wednesday, his first comments about the wild swings in the stock market that have cut into the gains made during his presidency.

Trump said the economy is strong and that those trading stocks will regret their actions.

"In the 'old days,' when good news was reported, the Stock Market would go up. Today, when good news is reported, the Stock Market goes down," Trump tweeted. "Big mistake, and we have so much good (great) news about the economy!"

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In the “old days,” when good news was reported, the Stock Market would go up. Today, when good news is reported, the Stock Market goes down. Big mistake, and we have so much good (great) news about the economy! — Donald J. Trump (@realDonaldTrump) February 7, 2018

The Dow Jones industrial average was up nearly 200 points in morning trading.

It fell more than 2,000 points from midday Thursday to Tuesday morning before gaining by the end of Tuesday.

The sell-off has been triggered by fears that a growing economy will raise inflation and lead the Federal Reserve to increase interest rates.

Trump has repeatedly highlighted the rising market as a testament to his economic stewardship over the past 12 months, most recently in his State of the Union address last week. His warning differs with the reaction of his Treasury secretary and Republican lawmakers, who've called the downturn a natural, expected reaction to economic conditions.

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Treasury Secretary Steven Mnuchin Steven Terner MnuchinLawmakers fear voter backlash over failure to reach COVID-19 relief deal United Airlines, unions call for six-month extension of government aid House Democrats plan to unveil bill next week to avert shutdown MORE said Tuesday that stock markets are “functioning very well” amid wild volatility after a day of record-breaking losses.

"I don’t think these types of moves, given how much the market has rallied, pose systemic risk," Mnuchin said. "You've seen a normal market correction, although large."

House Financial Services Committee Chairman Jeb Hensarling Thomas (Jeb) Jeb HensarlingLawmakers battle over future of Ex-Im Bank House passes Ex-Im Bank reboot bill opposed by White House, McConnell Has Congress lost the ability or the will to pass a unanimous bipartisan small business bill? MORE (R-Texas) said the downturn was “ironic, but totally predictable."

“Artificial interest rates have been helpful for some on Wall Street, but not many on Main Street,” said Hensarling, who had long called on the Fed to quicken the pace of rate hikes.

House Ways and Means Chairman Kevin Brady Kevin Patrick BradyBusinesses, states pass on Trump payroll tax deferral Trump order on drug prices faces long road to finish line On The Money: US deficit hits trillion amid pandemic | McConnell: Chance for relief deal 'doesn't look that good' | House employees won't have payroll taxes deferred MORE (R-Texas) said Monday that the stock market dip proved that the GOP tax bill passed enacted last month is already stimulating the economy.

“Corrections like this are normal," Brady said, arguing the tax downturn . “We want an economy where paychecks increase.”

Updated at 12:16 p.m.