FBI Director James Comey today dropped two more live grenades into our laps.

The first one is that the FBI can find no evidence, zero, that President Barack Obama ordered a wiretap of Donald J. Trump’s campaign office in Trump Tower. He cannot locate any indication that any order was given by a federal judge; he cannot find evidence of any sort of surveillance.

So …

The suggestion that the president of the United States essentially defamed his predecessor — when he tweeted the allegation of wiretapping — now has been given some credence.

The bigger grenade might be the second disclosure that Comey made to the U.S. House Intelligence Committee.

It is that the FBI is investigating whether the Trump campaign colluded with the Russian government to influence the outcome of the 2016 presidential election.

Comey said FBI policy usually doesn’t allow comment on active investigations. The director made an exception in this case. The public interest is too great to ignore, he said.

What in the world does that mean?

I believe that if the FBI determines there was collusion, that the Trump campaign worked actively with Russian spooks/goons/intelligence officers to torpedo the campaign of Hillary Rodham Clinton … well, I think we have a certifiable impeachable offense on our hands.

To be fair, there hasn’t been a shred of evidence presented yet to suggest any such collusion. There’s been a lot of chatter, gossip and what might be called charitably “circumstantial evidence.” We cannot go on circumstance, however. We need incontrovertible proof, man!

Let’s not get ahead of ourselves. Comey told committee members that this probe will require lots of time to complete. It’s complicated and detailed, he said.

Take all the time you need, Mr. FBI Director. I think we can wait for a detailed answer, no matter your conclusion.