They are protesting something that will never be created, because when the rhetoric was translated into reality, it was a proposal to reestablish the National Security Entry-Exit Registration System (NSEERS), which was in force through half of President Obama's presidency, and which tracks certain individuals who enter the United States based on country/region of origin and other factors. Useless publicity stunt with commensurate absolutely abysmal coverage by The Intercept.
8 U.S. Code Â 1182 - Inadmissible aliens
"Suspension of entry or imposition of restrictions by President:
Whenever the President finds that the entry of any aliens or of any class of aliens into the United States would be detrimental to the interests of the United States, he may by proclamation, and for such period as he shall deem necessary, suspend the entry of all aliens or any class of aliens as immigrants or nonimmigrants, or impose on the entry of aliens any restrictions he may deem to be appropriate."
"The Secretary of State and the Attorney General will invalidate all visas issued to Iranian citizens for future entry into the United States, effective today. We will not reissue visas, nor will we issue new visas, except for compelling and proven humanitarian reasons or where the national interest of our own country requires. This directive will be interpreted very strictly." -- President Jimmy Carter, April 7, 1980