Federal law is pretty clear on elections as is some state law if they don't change the law in the middle of an election. If a state cannot abide by the law, federal or state, then the election must be held again to protect the votes of the legal voters.
Any laws in place at the start of voting (thanks to the democrats that is now 90 days before election) must remain in place until after this election cycle is completed and that means the first week of January.
Polling operations shall be open to registered poll watchers at all levels. Failure to do so will result in the detention of the obstructing official(s).
Voting rolls shall be verified for completeness and accuracy every two years before a general election. The dead, convicted felons (in most states), and non-citizens cannot vote in a federal election. Each qualified citizen shall have only one vote in a federal election.
Mail in voting is highly subject to fraud and will not be authorized for a federal election.
The state's and municipalities are responsible for the segregation of state and federal ballots should the state not want to maintain the federal requirements for ballot health. Failure to do so is a federal felony.
All voters shall be required to present ID at the place of polling at the time of voting. Absentee ballots must have a legible signature that matches that on file and a legible postmark prior to and the day of the election during the time the polls are open.
Any state in violation of two or more of these laws must hold their election again within 20 days. Properly verified absentee ballots must be retained to enfranchise distant voters.
Michigan, Pennsylvania, Nevada, North Carolina, and Illinois are on notice.