Actually, therein lies the conundrum ! Nobody has the authority, because it is not addressed in the Constitution !
The Founding Fathers would never have believed that a nation-wide fraud could occur,
so they never delegated that authority to anyone, or any agency.
Since the election must follow the Federal Constitution, which Federal agencies haven't already been found to be complacent, co-opted, or complicit ?
The Federal agencies that don't respond to Congressional requests, directives, and subpoenas ?
The Federal Elections Committee is only an advisory board with no executive powers; or, an organization with all bark,..and no bite !
The Constitution places the burden upon the state legislators, to set law for elections. What state legislator will ignore proof of massive vote switching which changed the outcome? I wonder, is that why for the past 9 days the socialist serving media has been allowed to run amok, so when the proof of the criminality is revealed the media will be exposed along with the criminals who have tried to bring about this current coup attempt? Friday will be the tenth day since election day. Saturday will be the ‘day after’ a sting is sprung on these criminal bastards. ... It’s coming
The legislatures have the authority to decide how to remedy a fraudulent election. They should exercise that authority.
I suspect our Founding Fathers considered the possibility. They designed in the recourse: Congress.
Unfortunately, I have doubts on whether our elected representatives have the backbone for hard decisions. I hope they recognize that the choice on America's near-term future has been made, and they cannot avoid the inevitable by surrendering. All that will do is make minor adjustments to the timing.