Senate Democrats introduced a constitutional amendment on Tuesday to undo the 2010 Citizens United Supreme Court decision.

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Schumer added that "overturning Citizens United is probably more important than any other single thing we could do to preserve this great and grand democracy."

Democrats pledged that if they took control of the Senate during the 2020 election, they would bring legislation overturning Citizens United up for a vote.

The 2010 Supreme Court ruling prohibited the government from limiting spending by companies, nonprofit organizations and unions on political campaign advertisements. The court's majority wrote that such provisions would inhibit freedom of speech.