Under of the constitution, though the president cannot be summoned for questioning except on his voluntary willingness to testify in the court in support of his controversial deeds, the unconstitutional decisions taken by the president would be declared invalid by the courts. The case would be decided by the courts based on the facts furnished by the Union government for the president's role. As clarified by the supreme court in the case "Rameshwar Prasad & Ors vs Union of India & Anr" on 24 January 2006; though the president cannot be prosecuted and imprisoned during his term of office, he can be prosecuted after he/she steps down from the post for any guilt committed during the term of presidency as declared earlier by the courts. No president has resigned on impropriety to continue in office for declaring and nullifying his unconstitutional decisions by the courts till now. No criminal case at least on the grounds of disrespecting constitution is lodged till now against former presidents to punish them for their unconstitutional acts; though many decisions taken during the term of a president have been declared by the supreme court as unconstitutional, "mala fides", void, "ultra vires", etc.