The courts can stop him and indeed have in several cases. Often times higher courts over rule those lower ones but not always. Majority of the time they eventually end up siding with the executive branch though. So courts are doing their job. Checked and balanced.
Every check and balance is working its just not making decisions the left agrees with. This is indeed what democracy looks like though.
Mid terms are coming up and the people will once again have a chance to voice their opinion.
Note: I have been hit by the HN "posting to fast" limit so I can't respond.