Trump claims markets will crash if he is impeached

President TrumpDonald John TrumpGraham to introduce resolution condemning House impeachment inquiry Support for impeachment inches up in poll Fox News's Bret Baier calls Trump's attacks on media 'a problem' MORE claimed early Thursday morning that stock markets would crash if he were impeached.

"If they actually did this the markets would crash," the president tweeted, just hours before the acting director of national intelligence's public testimony before Congress.

"Do you think it was luck that got us to the best Stock Market and Economy in our history," he added. "It wasn’t!"

House Democrats formally launched an impeachment inquiry Tuesday evening following reports that Trump asked Ukraine's president to investigate former Vice President Joe BidenJoe BidenSupport for impeachment inches up in poll Overnight Defense: Trump's Syria envoy wasn't consulted on withdrawal | McConnell offers resolution urging Trump to rethink Syria | Diplomat says Ukraine aid was tied to political investigations Democrats say they have game changer on impeachment MORE and his son Hunter Biden.

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The White House released a partial transcript of the call on Wednesday, confirming the request from Trump and revealing that Trump encouraged Ukrainian President Volodymyr Zelensky to work with his personal attorney and the attorney general to investigate the unsubstantiated allegations.

Amid reports that impeachment was on the horizon, the Dow Jones dropped 0.5 percent, the S&P 500 slipped 0.8 percent and the Nasdaq composite dropped 1.46 percent on Tuesday.

While Tuesday marked the worst day for the S&P 500 and Nasdaq in a month, markets rebounded Wednesday and almost reached Monday's levels.

During the last two impeachment inquiries, for former Presidents Bill ClintonWilliam (Bill) Jefferson ClintonCNN: Biden likened Clinton impeachment to 'partisan lynching' in 1998 Trump 'lynching' comparison draws backlash from lawmakers House Democrat pledges 'there will be open hearings' in impeachment inquiry MORE and Richard Nixon, stocks fell. But economists have argued the dips were largely driven by outside factors including runaway inflation and the Asian currency crisis.

The U.S. economy has recently been affected significantly by the trade conflict between the U.S. and China.