Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellOvernight Defense: House passes T spending package with defense funds | Senate set to vote on blocking Saudi arms sales | UN nominee defends climate change record Overnight Defense: House passes T spending package with defense funds | Senate set to vote on blocking Saudi arms sales | UN nominee defends climate change record Senate to vote Thursday to block Trump's Saudi arms deal 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.