The Justice Department has opened an investigation into stock trades made by members of Congress after they were briefed on the Covid-19 coronavirus outbreak, reports CNN, citing two unnamed sources.

The inquiry is still in its early stages and is being carried out in coordination with the Securities and Exchange Commission, CNN says in its exclusive report, adding that it has included outreach from the FBI to Sen. Richard Burr (R-NC).

Burr, chairman of the Senate Intelligence Committee, says his decision to sell “between $628,000 and $1.7 million in stocks” in February was based only on “public news reports.

Burr denies any wrongdoing and has asked the Senate Ethics Committee to review the trades.

A lawyer for Burr issued a statement on Sunday saying that the senator “welcomes a thorough review of the facts in this matter, which will establish that his actions were appropriate.”

So far, CNN says, there is “no indication that any of the sales, including Burr’s, broke any laws or ran afoul of Senate rules” but it’s “routine for the FBI and SEC to review stock trades when there is public question about their propriety.”

In a Monday morning interview on CNBC’s “Squawk Box,” SEC Chairman Jay Clayton would not confirm the Burr inquiry, but he warned anyone with private, inside information against using it for personal gain.

“Anyone who is privy to private information about a company or about markets needs to be cautious about how they use that private information. That’s fundamental to our securities laws and that applies to government employees, public officials, etc, and the Stock Act codifies that,” Clayton said.

The Justice Department, the FBI and the SEC declined to comment.