The Reich Minister of the Interior [Frick] spoke about the Reichstag fire and the punishment of the culprits, and stated that it was urgently necessary to hang van der Lubbe at once, and that this needed to happen on Königsplatz at that. To be sure, the law that currently applied to arson only provided for a prison sentence, but it had to be possible to impose the penalty of death by hanging for such a heinous crime and to apply it retroactively.
An emergency change to the law after the fire played a huge role in allowing Hitler to gain abosulte power over Germany.