Biden directed the Labor Department to issue a temporary order to require all businesses with 100+ employees to have them vaccinated or tested weekly

Republican lawmakers and governors blasted the announcement as 'unconstitutional' and 'un-American' within minutes of its unveiling

Some Republican lawmakers are already threatening legislation to stop it

South Dakota Governor Kristi Noem threatened to mount a legal challenge 

Biden also announced a ramp up in testing, using the Defense Production Act to accelerate the production of rapid tests 

Biden will require all federal workers to be vaccinated, a part of a series of new mandates he'll push in a major speech on the COVID pandemic