By Act of Congress (Not the US Constitution) the President's letter of resignation goes to the US Secretary of State.
the Vice president should submit his resignation to the President
Hosni should resign
president
It depends on the reason why you resigned. If you think that you was forced to resign for a reason, then reinstatement is possible. Making someone to resign has many reasons, that before resigning there should be counseling, thus resignation paper should also be signed under oath to make it indeed official. Well, let your lawyer work it out if you believe that you are a victim of involuntary resignation, is it someone in the chain of command force you or is it a personal problem force you to resign?
Yes! He was duly elected and there is no reason why he should resign anyway. A different opinion: I do not think he should. I want president Oboma back!!
Why should he? Caldera did a stupid thing and was told to resign. End of story.
Only if he wants too
Only if he wants too
From what I gathered, it is becoming more common to tender a resignation letter via e-mail. However, you should think about it before you do it. You don't want to burn ay bridges. If curcumstances do not allow you to walk in to your superior's office and hand it to him or her in person, then an e-mail resignation is okay. I've had an out-of-province resign via e-mail.
A simple Mr President should be OK.
I believe that was Ford; Nixon resigned because it was either that or impeachment, and Ford followed Nixon. You should do some further research into that topic to get all the details.