Precedent

At Front Page Magazine Daniel Greenfield quotes Jimmy Carter back in 1980:

the Secretary of Treasury [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.

Greenfield concludes,

Apparently barring people from a terrorist country is not against "our values" after all. It may even be "who we are". Either that or Carter was a racist monster just like Trump.

...In November 1979, the Attorney General had given all Iranian students one month to report to the local immigration office. Around 7,000 were found in violation of their visas. Around 15,000 Iranians were forced to leave the US.

Read more here.