Senate Minority Leader Mitch McConnell (R-Ken.) (Alex Brandon/Associated Press)

The Senate's top Republican predicted Sunday morning that President Obama's health care law will be the biggest issue of the 2014 midterm elections.

"I don't know what the issues will be next year. If I were predicting what's likely to be the biggest issue in the 2014 election, I think it would be Obamacare," Senate Minority Leader Mitch McConnell said on NBC News's "Meet The Press." "I think it's coming back big-time."

McConnell (Ken.) echoed other Republicans who have noted that the IRS, which has come under scrutiny for singling out conservative groups for extra scrutiny, plays a key role in the implementation of some of the law's components.

"By the way, the IRS has a role to play in the implementation of Obamacare," McConnell said.