This is crazy and it goes beyond US interests.
This is very probable that the Mossad owns pictures of Biden raping children or something.
We are certain, since Epstein scandal that the Mossad works like this.
So you are implying a foreign intelligence agency has taken control over the presidency of the United States by keeping their most important authority under extortion.
I see a couple of problems which such theory, being the most obvious that it is quite improbable a foreign agent has very compromising information to threaten all politicians in Washington who are likely to become president someday.
We could argue that those which are not easy to manipulate by the Mossad are attacked or ignored by mainstream media, so cannot be chosen by the masses, but that would also imply the Mossad has control over all mainstream media in the United States.