"@BarackObama @Eastwood_ Greetings from coal country! Hazard, KY -MM," McConnell tweeted from the campaign's account.

The tweet is accompanied by a photo of the senator sitting at a bar with a beer, gesturing to an empty chair with a glass of wine next to it. The empty chair is an apparent reference to Clint Eastwood's unusual Republican National Convention speech, which he delivered largely to an empty chair meant to represent President Obama.

It's a response to a jab Obama issued at the White House Correspondents' Dinner this weekend. 

“[…Some] folks still don’t think I spend enough time with Congress. ‘Why don’t you get a drink with Mitch McConnellAddison (Mitch) Mitchell McConnellLawmakers feel pressure on guns Bipartisan group of House lawmakers urge action on Export-Import Bank nominees Curbelo Dem rival lashes out over immigration failure MORE?’ they ask. Really? Why don’t you get a drink with Mitch McConnell?” he said, to laughter from the crowd.

The McConnell campaign has indicated it plans to put particular emphasis on its digital and data efforts going into what could be a tough fight, if Democrats front a credible challenger and place McConnell at the top of their Senate target list, as they've indicated they plan to do.

No Democrat has yet entered the race, however.