Former President Donald Trump is appealing a decision by Maine’s Democratic secretary of state that he cannot be on the ballot there because he violated a constitutional ban against people who “engaged in insurrection” holding office.

Trump, whose front-running Republican candidacy could be threatened, appealed the Maine decision by Democrat Shenna Bellows, who became the first secretary of state in history to bar someone from running for the presidency under the rarely used Section 3 of the 14th Amendment. That provision prohibits those who “engaged in insurrection” from holding office.

The former president is expected to soon appeal a similar ban by the Colorado Supreme Court. That appeal would go to the U.S. Supreme Court, while Bellows’ action is being appealed to a Maine Superior Court.

Trump’s appeal on Tuesday asks that Bellows be required to place him on the March 5 primary ballot. The appeal argues that she abused her discretion and relied on “untrustworthy evidence.”