Michael Cohen, the one-time fixer for Donald Trump, has pleaded guilty to lying to Congress about a whole host of issues relating to whether his former friend had dealings with Russians.

He took an oath to tell the truth. He lied. He has admitted to doing it.

As nearly as I can tell from a distance, I perceive that members of Congress take truth-telling to them quite seriously, especially when it involves witnesses they summon to speak to them.

Thus, Cohen’s admission of lying to Congress opens up the question of impeachment. I am not exactly pushing for an impeachment of the president of the United States.

However, the possibility now seems a bit more likely in light of what the one-time Trump pal has admitted to doing. Cohen now has revealed that he lied to Congress, he contradicts the very point that Trump has made to Congress, that he had “no deals” in Russia during the 2016 presidential campaign.

All of this opens up the gigantic door for House members — led by the new Democratic majority — to start asking some probing questions. Oh, yes . . . it also sends some clear signals to special counsel Robert Mueller, who is piecing all of this together while developing his final report on his probe into “The Russia Thing.”

One lies to Congress at his or her own peril. Even if you’re a member of the same party of those who run the show on Capitol Hill.