It’s not illegal to vote for an ineligible President. The US Constitution was developed after a delegation of some of the sovereignty that was gifted to the people and the states by God. God did not bestow sovereignty upon the US Constitution or Congress or the Supreme Court. The people and the states delegated sovereignty, immunities and privileges to the US federal government and may cancel the delegation of authority by electing an ineligible President.
The Eligibility Clause is not used to prevent the will of the people. The Eligibility Clause is used to determine if the people have cancelled the delegation of authority granted to the US federal government by the American people.
Review the Noel Canning Apppointments Clause challenge in the courts against the NRLB. The courts ruled Obama violated the Appointments Clause. Obama wasn’t removed from office for violating the Constitution. Obama was put in office by the will of the people. The courts are not authorized to terminate the will of the people. The courts are authorized to terminate the appointments made in violation of the Appointments Clause and rule all of the actions by those appointees are voided.
With a violation of the Eligibility Clause, the ineligible President is not removed. The courts and the Congress are servants of the people. The appointments, bills signed into law, and all others actions of the ineligible President are voided because the people have voted to install an ineligible President and move forward with new, national governing decree.
I never said that it was illegal to vote for an illegal president. I posted the federal regulation (Administrative Law) which states that two members of Congress (one must be a Senator and one must be a representative) can challenge the Electors of any president-elect and then both Houses of Congress must convene separately and consider the challenge. Members of Congress alleging an ineligible president-elect would have led to a fascinating debate in Congress.
It is the Electors and Congress via votes in a dual session who choose the president, not the popular vote of citizens