Today, the state Supreme Court will hear a lawsuit by a group of Colorado voters who want to bar former President Donald Trump from the state’s ballot next year over his involvement in the January 6, 2021, attack on the US Capitol. The voters, supported by the watchdog group Citizens for Responsibility and Ethics in Washington, argue that Trump is ineligible to run for president again under an amendment to the US Constitution that was passed after the Civil War. The amendment prohibits public officials who have participated in “insurrection” from holding federal office. The lawsuit, which will start today, is seen as a test case for a broader effort to challenge Trump’s 2024 candidacy under Section 3 of the 14th Amendment of the Constitution. A lower court ruled last month that Trump incited insurrection by urging his supporters to storm the Capitol in a failed attempt to stop Congress from certifying Democrat Joe Biden’s win in the November 2020 election and block the transfer of power.

Despite the amendment that could disqualify Trump from the Colorado Republican primary, Judge Sarah Wallace ruled that he could stay on the ballot because he was not “an officer of the United States” as president.

The voters’ lawyers contend that the judge’s decision contradicts the US Constitution and “common sense.”

They wrote in a court document that “it would be illogical to bar insurrectionists from every other federal or state office except for the most influential and powerful one in the country.

Trump, who leads the 2024 Republican race, has appealed to the state Supreme Court to affirm the ruling that lets him stay on the ballot. His lawyers have denied the accusation that he took part in insurrection and claimed that courts lack the power to exclude candidates from the ballot under the constitutional clause.

Several states have faced lawsuits from watchdog groups and anti-Trump activists who question Trump’s eligibility, but courts have dismissed all efforts to remove Trump from the ballot.

Trump’s campaign has branded the legal challenges as an “un-American” attempt to stop voters from picking their favored candidate.

The US Supreme Court can review the Colorado Supreme Court’s decision.