October 31 at 7:15 AM

In a letter to FBI Director James B. Comey on Sunday night, outgoing Senate Minority Leader Harry M. Reid (D-Nev.) says Comey may have broken the law.

And that's not even the most brazen claim in the letter — not by a long shot.

In the course of arguing that Comey's disclosure that the FBI is looking into new Hillary Clinton investigation emails may have violated the Hatch Act, Reid slips in an extremely bold claim about the Trump campaign and the Russian government.

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.

Even for a man known for bare-knuckle politics, this is remarkable.

Reid is saying that he has been told the FBI has evidence of possible collusion between the Trump campaign and the Russian government. And he's not just saying this information came from mysterious and unnamed national security officials; he's saying Comey himself has left him with this impression.

What are the questions that remain unanswered about the renewed Clinton email investigation?

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The Post’s Matt Zapotosky breaks down the unknowns following the FBI’s announcement on Oct. 28 that it will renew its Hillary Clinton email probe. The Post’s Matt Zapotosky breaks down the unknowns following the FBI’s announcement on Oct. 28 that it will renew its Hillary Clinton email probe. (Video: Bastien Inzaurralde/Photo: Melina Mara/The Washington Post)

To be clear, Democrats including Reid have argued for months and months that the Russian government wants Trump elected president, citing hacks into Democrats that intelligence officials say probably originated in Russia. Trump himself has stoked the fire by saying nice things about Russian President Vladimir Putin, and his former campaign manager's ties to Russian interests are well chewed-over.

But there is no public evidence to support Reid's claim of actual "coordination" between the Trump campaign and the Russian government. And were that to be the case, it would be a scandal of epic proportions.

Asked what evidence exists of such a connection, Reid spokesman Adam Jentleson cited classified briefings.

"There have been classified briefings on this topic," Jentleson said. "That is all I can say."

Asked whether the letter means Comey has shared such information directly with Reid, Jentleson said, "Refer you to the language in the letter."

This is the political equivalent of Reid lighting a match, dropping it on a dry ground and walking away.

Anybody who has studied Reid's political career, of course, won't be terribly surprised. We don't have to look too far in the rear-view mirror to find another example of Reid offering an evidence-free claim about a Republican presidential candidate.