Final answer:
The necessary proof of action to issue a disqualification depends on the context. In the case of the U.S. presidency, conviction in an impeachment case can lead to disqualification. Proof of legitimacy through election results may also be necessary.
Step-by-step explanation:
The necessary proof of action to issue a disqualification is outlined in different contexts. In the case of the U.S. presidency, a person can be disqualified from holding the office if they are convicted in an impeachment case by the Senate.
In a democratic government, elected officials must demonstrate that they secured the sufficient number of votes in the election to merit holding office, which can serve as proof of legitimacy.
Proof of action can also be required in cases where the president temporarily declares their disability and then re-declares their ability to perform as president.