Wish to marry my love in Tunisia

I have had a online relationship for 4 years with a man I love in Tunisia.  I just spent two weeks with him in Tunisia.  We now wish to marry and I would like him to come live with me in the US, California.  I will return to marry him in Tunisia.  I need any advise on how difficult or easy will it be for him to leave Tunisia with me? Serious answers to this process would be appreciated.

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