U.S. Rep. Adam Schiff (D-Calif.) on March 24 introduced a constitutional amendment to overturn the Supreme Court’s Citizens United decision and allow for reasonable restrictions on corporate campaign contributions and other spending.

In 2010, the Supreme Court ruled in Citizens United v. Federal Election Commission that corporations and special interest groups could spend nearly unlimited funds on election campaigns, Schiff said.

In the decade since, outside groups spent more than $4.4 billion in federal elections – nearly $1 billion of which was untraceable “dark money” – with some of the biggest contributors coming from Wall Street, the pharmaceutical industry and the National Rifle Association.

It would also allow states to enact public campaign financing systems, which can restrict the influence of corporate and private wealth.