If your boss’s political views motivate you to take unreasonable actions, you should probably keep them to yourself. But President Donald Trump doesn’t seem to realize this. He is inflaming our political tensions.

“There were big protests in Germany, there were big protests in France,” Trump said in his address to a joint session of Congress last week. “They took these stadiums, built them up.”

Of course, it doesn’t work that way. The stadiums were built months or years before the election. And then, when Germany beat France in the 2018 World Cup final in Russia, German Chancellor Angela Merkel took to the field and shook hands with her fellow soccer fan.

“The only sure way to deal with Vladimir Putin is to give him a nuclear-arms freeze,” Mr. Trump said in his State of the Union address, referring to the practice of not trading nuclear weapons with allies.

It’s a tricky issue. Giving the Russians a nuclear freeze, even with some restrictions, would be a step in the wrong direction and build further mistrust between our allies. But the president didn’t make a sensible case. He said these “tensions” were attributable to his predecessor, Obama.

“A man who out-negotiated our negotiators on the world stage,” Trump said, “put aside our defenses, and compromised our alliances.”

As our two statesmen engage in a strange dancing contest with Russian President Vladimir Putin, we know what’s coming: Russians will meddle in our election. If this is not a crisis, it ought to be.