Read the Colorado ruling that bars Trump from the state ballot The Colorado Supreme Court ruled Donald Trump is not eligible to become president again after engaging in insurrection. Read the Colorado justices' full ruling.

Read the Colorado Supreme Court ruling that kicked Trump off the state primary ballot

Former President Donald Trump greets supporters as he arrives at a rally on Tuesday in Waterloo, Iowa. Charlie Neibergall/AP hide caption

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Charlie Neibergall/AP

Former President Donald Trump greets supporters as he arrives at a rally on Tuesday in Waterloo, Iowa.

Charlie Neibergall/AP

The Colorado Supreme Court on Tuesday issued a historic ruling, saying Donald Trump is not eligible to become president again after engaging in insurrection.

The decision bars him from the state's primary ballot.

Trump's campaign said immediately it would appeal the ruling to the U.S. Supreme Court.

In the decision — which was a 4-3 ruling — the Colorado justices wrote: "We do not reach these conclusions lightly. We are mindful of the magnitude and weight of the questions now before us. We are likewise mindful of our solemn duty to apply the law, without fear or favor, and without being swayed by public reaction to the decisions that the law mandates we reach."

The full ruling is below.