Well he's still following checks and balances. Courts rules his travel restrictions unconstitutional, albeit clearly by the most overturned circuit in the nation that has a strong liberal bias, he doesn't go on enforcing the policy. He instead opts to revise the policy to make it more in line and fix some issues both sides had with it (eg the visas). And he still had the right to appeal it to the Supreme Court since circuit courts aren't the final say on legal issues.