Twentieth Amendment, Section Three places the burden of proving eligibility upon the President elect. If he/she cannot, or "fails" to do so, Congress is instructed to name a replacement. Congress has avoided its duty now twice. This means there is no legal President at this time. I've proven this to be the case on numerous threads.
Prove to whom? You're talking about enforcing federal law. What law gives the responsibility to what federal agency for examining candidate qualifications and ensuring they are correct?
The Oath of OfficeWhy do you, and others, raise your right to God and place your left hand on His Holy Word and swear to "uphold and defend the Constitution?" What should happen when someone deliberately ignores this oath?
I don't expect an answer...