A Virginia delegate to the Republican National Convention has filed a class action lawsuit in federal court challenging a state law that binds delegates to support the primary winner at the nominating convention, according to a report by NBC News.

“The outcome of the lawsuit could have significant implications for Donald Trump’s nomination, as it will be a test case of a key argument being pushed by some Trump opponents who want to see him stopped at a contested convention,” wrote .

Plaintiffs are challenging state laws that require delegates to vote for a specific candidate, saying those rules are unconstitutional. They claim that delegates to the national convention should be allowed to vote for whomever they please. They base their claims on the First Amendment’s protection of the right to assemble, the article reports.

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