It's expected that Congress would vote on either of the candidates not just vote on whomever, but to be fair the fact that we're talking about politicians means they could "interpret" Article II in some BS way and say "We choose Snuffy Smith" and ignore all or any nominees.

As for the VP the Senate chooses

If that happens it would certainly go before the Supreme Court unless the People execute them for being a domestic enemy of the Constitution.

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