The court heard arguments about whether the former president’s attempts to subvert the 2020 election disqualify him from again holding office. Justices across the ideological spectrum questioned several aspects of a ruling from the Colorado Supreme Court.
And a large part of the SCOTUS scepticism is why should one state be able to decide that as a matter of fact for the rest of the country. From their point of view this should be a federal decision.
And typically you wouldn’t see Congress declare a single person as traitorous. Congress could declare Jan6 an insurrection, and then anyone involved who believes they should get an exception is allowed to seek remediation by Congress. Hardly a chicken and egg problem.
States have always determined candidate eligibility on their own. Congressional special bi partisan committee did declare this an insurrection.