McConnell told reporters Monday that he's confident Democrats will field a good candidate and that he's preparing accordingly.
Kentucky's senior senator had banked more than $6 million by the end of June for his re-election campaign, which is still more than two years away.
The early start in fundraising sends a not-so-subtle message to potential Democratic challengers that McConnell is bent on winning a sixth term. He spent $20 million on his last election and won by 6 percentage points to become the longest serving U.S. senator in Kentucky history.