One of the defenses Donald Trump’s attorneys have offered in the U.S. Supreme Court appeal of a Colorado decision could “topple” the authority of state courts, according to a legal expert. The Colorado Supreme Court ruled in December that the former president should be ineligible from holding office under the U.S. Constitution’s insurrection clause, and MSNBC legal analyst Lisa Rubin said one of Trump’s arguments could undermine the entire system of appeals. “I think the outcome is going to be that the court does not disqualify Donald Trump from being on presidential primary ballots,” Rubin to…