Here’s something that could put a scare into Wall Street: Citing three unidentified sources, Fox News said late last week that House Intelligence Chairman Devin Nunes told Republican colleagues behind closed doors that he has seen evidence of clear “abuse” of government surveillance programs by the FBI and the Justice Department.

Let me add this.

I’m hearing that congressional investigators are looking into something called the Domestic Intelligence Exploitation Program, or Domex. (It’s different from the Domex run by Homeland Security.)

If Congress and special counsel Robert Mueller haven’t done so already, they should ask former FBI boss James Comey and John Brennan, who used to run the CIA, about this program.

I’m told it’s a longstanding and top-secret operation that taps personnel from various spy agencies — but is independent. That gives each agency the ability to deny it is in on it.

The secret Domex operation is reportedly used to keep tabs on US citizens, a practice that’s illegal. And President Trump — who claimed he was wiretapped during the campaign — could have been one of them.

It will be interesting to see what Nunes comes up with.

Financial markets, of course, have been moving upward blissfully. But if the US has dirt on Trump from wiretaps and it imperils his presidency, the bliss may end.