One aspect and a very real possibility, is that Melania Trump is a Russian Operative. Think how easily it could have been planned and carried out. If you're a scheming underhanded foe of the United States - like Vladimir Putin - how simple and underhanded and easy it would be to exploit a willing "useful idiot" Like Trump? Simply recruit a beautiful much younger operative - Like Melania - to ingratiate herself with a uniquely positioned American Celebrity/ politician and then quietly and persistently convince him to run for POTUS, then manipulate the election process as much as possible, hoping beyond hope the "Usefuil Idiot" would actually win?
There's no question that Trump embodies everything a scheming Russian leader with a KGB upbringing would look for in an American stooge: He has the name recognition, the wealth and most importantly - the exploitable ego to manipulate. Sound like too much of an "James Bond" theory? No.....not by a long shot. Think about it: Do you really think a much younger and pretty woman would be attracted to a slob like Donald Trump? He's about as attractive as Hugh Heffner is to Playboy Bunnies. No....she has all the markings of a stealth agent, put in place to seduce an American target in order to gain access to the very heart of American government.
The more you look at it, the more it makes sense. Many times the most obvious answers are hiding in plain sight.