FBI director James Comey may be a criminal, says the top Democratic leader in the Senate.

“Your actions in recent months have demonstrated a disturbing double standard for the treatment of sensitive information, with what appears to be a clear intent to aid one political party over another,” Nevada Sen. Harry Reid said in a public letter to the FBI director, released Sunday, Oct. 30.

“I am writing to inform you that my office has determined that these actions may violate the Hatch Act, which bars FBI officials from using their official authority to influence an election. Through your partisan actions, you may have broken the law,” Reid claimed.

Comey is unfairly aiding the GOP candidate, Reid claimed, by hiding critical information about Russian support for Donald Trump even as he also raises suspicions about Hillary Clinton:

The double standard established by your actions is clear. In my communications with you and other top officials in the national security community, it has become clear that you possess explosive information about close ties and coordination between Donald Trump, his top advisors, and the Russian government – a foreign interest openly hostile to the United States, which Trump praises at every opportunity. The public has a right to know this information. I wrote to you months ago calling for this information to be released to the public. There is no danger to American interests from releasing it. And yet, you continue to resist calls to inform the public of this critical information. By contrast, as soon as you came into possession of the slightest innuendo related to Secretary Clinton, you rushed to publicize it in the most negative light possible. Moreover, in tarring Secretary Clinton with thin innuendo, you overruled longstanding tradition and the explicit guidance of your own Department. You rushed to take this step eleven days before a presidential election, despite the fact that for all you know, the information you possess could be entirely duplicative of the information you already examined which exonerated Secretary Clinton… The clear double-standard established by your actions strongly suggests that your highly selective approach to publicizing information, along with your timing, was intended for the success or failure of a partisan candidate or political group.

During his many years in politics, Reid has played tough. In 2012, Reid falsely claimed that GOP presidential candidate Gov. Mitt Romney had not paid his federal taxes for a decade. The statement was untrue, but Reid remains unapologetic for participating in the Democratic effort to smear Romney. In September 2016, Reid was asked about his statement by the Washington Post, and he replied:

People bring that up, it’s one of the best things I’ve ever done. Why? Because I knew what he had done was not be transparent and forthright about his taxes and to this day he hasn’t released his tax returns. … Did I want to do that? No. I had the information, I tried to get somebody else to do it. I tried to get somebody in the Obama ‘reelect,’ I tried to get one of the senators, I tried to get one of the outside groups, but nobody would do it. So I did it. And with that, like everything, I think in life, here’s something I learned from my father, if you’re going to do something, don’t do it half-assed, don’t play around. With the Mitt Romney stuff, I didn’t play around.

Read the Senator’s letter here.