Sen. Charles Schumer Chuck SchumerJacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee CNN's Toobin: Democrats are 'wimps' who won't 'have the guts' to add Supreme Court seats Republican senator says plans to confirm justice before election 'completely consistent with the precedent' MORE (D-N.Y.) says he regrets the decision by Democrats in 2013 to trigger the "nuclear option" for most presidential nominations.

The change to the Senate rules lowered the threshold for confirming Cabinet nominees to a simple majority vote — something that will now help President-elect Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE push through his nominees.

"I argued against it at the time. I said both for Supreme Court and in Cabinet should be 60 because on such important positions there should be some degree of bipartisanship," Schumer told CNN.

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"I won on Supreme Court, lost on Cabinet. But it's what we have to live with now."

The "nuclear option" was triggered by former Senate Democratic leader Harry Reid Harry Mason ReidOn The Trail: Battle over Ginsburg replacement threatens to break Senate Democrats fear Russia interference could spoil bid to retake Senate Graham signals support for confirming a Supreme Court nominee this year MORE (D-Nev.), who retired at the end of the last Congress. Schumer is taking his place as leader of Senate Democrats in the new Congress.

In 2013, Democrats in the Senate altered the filibuster rules, lowering the number of senators needed to confirm presidential nominees from 60 to a simple majority of 51. Supreme Court nominations were excluded from the change.

The rule change was approved on a majority line vote, a tactic that had long been dubbed the nuclear option because of its potential to blow up bipartisan relations in the Senate.

Republicans to this day remain angry at Reid for the maneuver, but have praised Schumer, saying he sought to reach a compromise.

A Republican source last month told The Hill that Schumer worked for six months to prevent the nuclear options from being used.

With Republicans holding a 52-48 majority in the new Senate, they can push through Trump's nominees without Democratic support.

Still, Schumer confirmed in a statement Sunday that Democrats plan to fight many of Trump’s Cabinet choices, though they will need Republican defections to stop them.

Alexander Bolton contributed.