He was having lunch at Bristol Bar & Grille in his hometown.
As it happened, hundreds of people were protesting outside Lousiville's Immigration and Customs Enforcement Office, just a few kilometres from the restaurant.
Among them were leaders of the local chapter of the Democratic Socialists of America, whose national fame has been growing since one of its members upset the Democratic incumbent in a New York primary last month.
So when someone spotted McConnell at the restaurant and asked for help confronting him, the group helped spread the word on social media.
And within a few minutes a scene was made outside the Bristol Bar & Grille.
That scene was just like the ones that happened after Trump's homeland security secretary was spotted dining last month (and then Trump's press secretary and his EPA administrator a few days after that (and McConnell and his wife, Elaine Chao, (who is also President Donald Trump's transportation secretary) in a separate incident as they left a dinner two weeks ago).
At least half a dozen people, several with cameras, were waiting in front of the restaurant when McConnell walked out, with his checkered shirt tucked into his jeans and two dining companions at his side.
"Vote you out, vote you out!" the crowd began to chant.
"Where are the children?" one of them asked, not for the last time.
The three men didn't stop or slow, or even look at the crowd, though someone shouted "Go home!"
As McConnell's party turned a corner into the parking lot, a woman with an ankle-length dress and a backpack tried to block their path. She walked a step ahead of the Senate's top Republican, and the rest of the crowd followed close behind, still chanting and shouting.
"Where are the babies, Mitch?"
"Turtle head!"
The Democratic Socialists claimed several members in the crowd. But Andrew Massie, whose video of the confrontation went viral, said later that the socialists didn't invite the man who called the majority leader "turtle head" - and a few moments later shouted: "We know where you live too, Mitch! We know where you live! Yeah! We know where you live, Mitch!"
McConnell still said nothing; he simply climbed into the back seat of an SUV with a "Team Mitch" sticker on the window. The two other men (one of them a top state Republican, according to the Courier-Journal) got into the front, and the protesters could only shout at them as the engine fired up.
"Abolish ICE, abolish ICE!" they chanted.
"No justice, no peace!"
"No comfort for fascists!" said the turtlehead man.
"We did good, fellow citizens," one of group congratulated the rest as the Highlander headed toward the alley. And true enough, video of the impromptu protest would be seen by hundreds of thousands of people, and make national news, and be praised by those on the left who think Trump's allies deserve no peaceful meals while hundreds of migrant children are still being held from their parents.
But not everyone thought so.
As McConnell's SUV left the parking lot, one of the videographers turned around to see a red convertible idling behind them, its driver glaring.
"Let them live their lives," the man said as he pulled up beside the group. "It's none of your f***ing business."
Now a few of the protesters stopped chanting after the departed majority leader and turned on this driver who would dare confront the confronters.
"What a potty mouth!" a woman behind the camera jeered. "Keep on talking, fella, you're going to be a star."
Like McConnell, the man in the convertible made no reply. He soon left the parking lot, too, accompanied by indistinguishable angry screams.
