Assuming they can get past the veto-2/3 majority dance. It also strongly depends on the nature of the EO. Major economic restructurings have been struck down be

Assuming they can get past the veto-2/3 majority dance. It also strongly depends on the nature of the EO. Major economic restructurings have been struck down before, though usually by judicial review. Military deployments, most infamously WWII-era internment, are less likely to be challenged - especially if they're perceived as "ephemeral" irrespective of consequences.