Deporting Hitler is not an option that comes up. After using the internal ministry on the far right three times, you can keep repeating the action with no change in text or anything.
Viewing post in Social Democracy: An Alternate History comments
Deporting Hitler:
- Pick the Interior Ministry card and Improve interior loyalty 1x and investigate far right 2x
- Nazi Alarm needs to be above (or at??) 3, for this to happen Nazis need to be gaining in elections (above 10) and for the SPD to support NeoRevisionists and focusing on the Nazis in game events.
- The SPD still needs to control the Prussian government
- Justice either needs a big (-1 budget) reform or two minor judicial reforms
- If all above has been done successfully then the option to Deport Hitler should be available in the next Interior Ministry card
- The Reichsbanner needs to be at a high enough militarisation/size to succeed in deporting Hitler. I recommend banning the SA right before deporting Hitler if possible
That's the guide on the reddit