Maine’s Democratic secretary of state on Thursday removed former President Donald Trump from the state’s presidential primary ballot under the Constitution’s insurrection clause, becoming the first election official to take action unilaterally as the U.S. Supreme Court is poised to decide whether Trump remains eligible to continue his campaign.

The decision by Secretary of State Shenna Bellows follows a December ruling by the Colorado Supreme Court that booted Trump from the ballot there under Section 3 of the 14th Amendment. That decision has been stayed until the U.S. Supreme Court decides whether Trump is barred by the Civil War-era provision, which prohibits those who “engaged in insurrection” from holding office.

The Trump campaign said it would appeal Bellows’ decision to Maine’s state court system, and it is likely that the nation’s highest court will have the final say on whether Trump appears on the ballot there and in the other states.

Bellows found that Trump could no longer run for his prior job because his role in the Jan. 6, 2021, attack on the U.S. Capitol violated Section 3, which bans from office those who “engaged in insurrection.” Bellows made the ruling after some state residents, including a bipartisan group of former lawmakers, challenged Trump’s position on the ballot.