Long Islanders along with millions of Americans who work at companies with 100 or more employees are facing a Jan. 4 federal vaccine mandate or weekly testing.

MORE: Key takeaways as US sets Jan. 4 vaccine mandate deadline

The requirements will apply to about 84 million workers at medium and large businesses across the country.

MORE: US mandates vaccines or tests for big companies by Jan. 4

Attorneys general sent an open letter to the Biden administration blasting the mandate. The letter says, "Your plan is disastrous and counterproductive...this edict is unlikely to win hearts and minds - it will simply drive further skepticism. Americans will simply leave the job market instead of complying." It goes on to say "it suggests that the vaccinated need protection from those, who for whatever personal reason choose to or cannot receive the COCID-19 shot."

Employment attorney Randy Kleinman says the way it's drafted and the way it's being implemented is constitutional.