Sen. Bernie Sanders voiced his opposition to packing the Supreme Court on Monday.

Sanders, the independent senator from Vermont, told attendees at the We the People Membership Summit in D.C. that he has concerns with expanding the number of justices who sit on the court, a proposal raised by other White House hopefuls such as South Bend, Ind., Mayor Pete Buttigieg.

“My worry is that the next time the Republicans are in power, they will do the same thing so I think that is not the ultimate solution," he said.

Instead, Sanders, who unsuccessfully ran for the Democratic Party's presidential nomination in 2016 against Hillary Clinton, suggested term limits or a rotation system with federal appeals court judges so "new blood" could serve on the country's highest bench.

Buttigieg has floated the idea of adding another six seats to the Supreme Court, increasing the size of the bench to 15, numerous times during his national book tour and on the campaign trail. Sens. Kirsten Gillibrand of New York and Elizabeth Warren of Massachusetts, as well as former Rep. Beto O'Rourke of Texas, have also indicated an openness to the idea, though they have not spoken about specifics.

The We the People Summit was organized by liberal activist groups to provide their members with the opportunity to hear from and ask questions of eight White House contenders ahead of the primary elections.