Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellSenate Republicans eye rules change to speed Trump nominees McConnell blocks bill to reopen most of government Overnight Health Care: Thousands more migrant children may have been separated | Senate rejects bill to permanently ban federal funds for abortion | Women's March to lobby for 'Medicare for All' MORE (R-Ky.) warned Democrats Thursday that they’d regret using the “nuclear option.”

“You’ll regret this, and you may regret this a lot sooner than you think,” McConnell said on the Senate floor.

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Senate Majority Leader Harry Reid (D-Nev.) on Thursday started the process of invoking the nuclear option, saying he wanted to change Senate rules to prevent the minority from filibustering any nominations other than those to the Supreme Court.

McConnell opposes the effort and argues Democrats are just trying to distract the public from ObamaCare's botched rollout.

In a bid to prevent the move, he offered a motion that would have the Senate adjourn.

Reid has threatened to use the nuclear option several times this year. But each time lawmakers gathered to discuss alternatives.

At the beginning of the year, Republicans vowed not to filibuster any of President Obama’s nominees unless there were “extraordinary circumstances.” Democrats say the GOP has reneged on that promise.

Reid has been frustrated with the Senate's inability to move forward with three of Obama's judicial nominees to the country's second most powerful court.