That's hypothetical at best, since nobody is able to prove in a court that he was elected illegally. You might know it and I might know it, but he's still the president because no court agrees with us.
And even if you wanted to go that route, Trump still couldn't be president because he was never sworn in, even if he was the legally elected winner. So there's no combination of facts that support Trump being the current president in any form.
Constitutionally, if someone illegally gets elected, it is null and void. Just because Bidan got "sworn" in, doesn't mean he is president. Optics
That's hypothetical at best, since nobody is able to prove in a court that he was elected illegally. You might know it and I might know it, but he's still the president because no court agrees with us.
And even if you wanted to go that route, Trump still couldn't be president because he was never sworn in, even if he was the legally elected winner. So there's no combination of facts that support Trump being the current president in any form.