Senate Republicans are moving to keep the Supreme Court at nine justices as a growing number of Democratic 2020 contenders have expressed an openness to expanding it. 
 
Roughly a dozen Republican senators introduced the resolution on Monday that would keep the Supreme Court at nine justices. 
 
"The Democrats' court-packing proposal represents the latest shortsighted effort to undermine America's confidence in our institutions and our democracy," Sen. Marco RubioMarco Antonio RubioDemocrats ramp up warnings on Russian election meddling Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump Lincoln Project expands GOP target list, winning Trump ire MORE (R-Fla.), who spearheaded the resolution, said in a statement.
 
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He added that he was introducing the constitutional amendment "to prevent the delegitimizing of the Supreme Court."
 
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The Senate resolution would specify that the Supreme Court "shall be composed of not more than 9 justices." A similar resolution was introduced in the House late last week. 
 
Enacting a constitutional amendment would be an uphill battle, if not an impossible goal. The amendment would first need to win over two-thirds of both chambers of Congress, and then be ratified by three-fourths of the states.
 
But Rubio first announced last week that he would introduce the amendment after several Democratic White House contenders, including a handful that are Rubio's Senate colleagues, expressed an openness to expanding the Supreme Court or enacting other judicial reforms, including term limits. 
 
Both Sens. Elizabeth WarrenElizabeth WarrenNew poll shows Markey with wide lead over Kennedy in Massachusetts Trump and allies grapple with how to target Harris Chris Wallace: Kamala Harris 'not far to the left despite what Republicans are gonna try to say' MORE (D-Mass.) and Kamala HarrisKamala HarrisCandidates on Biden's VP list were asked what they thought Trump would nickname them as part of process: report Bass on filling Harris's Senate spot: 'I'll keep all my options open' Election security advocates see strong ally in Harris MORE (D-Calif.) have said expanding, or "packing," the court should be an option on the table as part of a larger conversation among Democrats about the direction of the U.S. judicial system.

 
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But Rubio countered in a Fox News op-ed last week that trying to expand the courts had become a "litmus test" for White House hopefuls and stemmed from an "ugly, winner-take-all rhetoric" among progressives.