A law professor is testifying on how the “insurrection” provision in the U.S. Constitution can bar a presidential candidate from the ballot. The testimony came Wednesday in a Colorado lawsuit to keep former President Donald Trump from running again for his old job. Section Three of the 14th Amendment bars anyone who “engaged in insurrection” against the Constitution from holding higher office. Gerard Magliocca, a law professor at Indiana University, said the record from the 1868 drafting of the amendment shows it was intended to apply to the presidency. The plaintiffs in the case claim Trump is barred because of the Jan. 6, 2021, attack on the U.S. Capitol.