It's rare but presidents to occasionally not sign laws or defer it to the constitutional court. Horst Köhler famously did this with the law that was supposed to

It's rare but presidents to occasionally not sign laws or defer it to the constitutional court. Horst Köhler famously did this with the law that was supposed to allow the Luftwaffe to shoot down civilian airplanes in case of a 9/11 scenario. The court of course ruled against the law.