US President held hostage

What if a US President was captured & held hostage? I know it sounds like a Hollywood B-Grade movie, but there have been numerous US Presidents who were notorious at scoffing at security & thus opened the prospect of being taken captive by one group or other.

So which President could have been taken captive?

Who could this group be?

What would be their demands?

What effect would this have on the US?

Anything else?
 
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