Despite keeping him on the presidential ballot, a Colorado judge’s ruling could still prove “devastating” for former President Donald Trump, a former solicitor general has said.

Speaking with MSNBC host Jen Psaki on Sunday afternoon, former Acting Solicitor General Neal Katyal said that a Colorado court finding that Trump engaged in insurrection against the government after the 2020 presidential election was “the very worst decision Trump could get.”

“There’s a factual finding that the judge said, which is that Trump committed insurrection,” Katyal said of District Judge Sarah B. Wallace’s ruling. “On appeals, the factual findings get massive deference by the appeals court. It’s almost impossible to overturn a trial judge’s factual finding.”