Just as with the Clintons, there is a false scandal associated with a US president.
I suppose it is like the sword of Damocles. It is spread by TPTB. It is a false threat.
The US Constitution requires a "natural born citizen" in order to be eligible for the post. As opposed to a legal person. That can be a corporation. Even if as is likely, he was born in Kenya, he is eligible. By concentrating attention on the false weakness, the real weakness is further protected. Thge other political party plays along of course.
With Bubba it was his philandering. By taking up so much time of those who pursue the false path, the president is protected from actual legal attack, despite their previous crimes and potential vulnerability.
Of course, should a compromised president be rash enough to "go off the reservation" or "go native" then the true weakness can be used or else the false one implemented. The impeachment of Bubba might have become more serious had he not repealed along with CONgress, various statutes concerning financial protection of banking. The Whitewater matters could have been thrown into the proceedings, or else CONgress blackmailed into impeachment for lying.