If the US government really bans H1-B, J-1 etc., the US science will be dead soon, which means the US industry and technology, too (for those who don't care about science but care about money). 1/

There are things we can do. 2/
"This would be a good time to contact your Senators, Congressman, Governors and lobbyists to let the White House know this would adversely impact your business which could result in job losses for your US workers." https://www.visalaw.com/new-executive-order-f-h-l-j-nonimmigrant-categories-expected-soon-june-9-2020/

Yes, banning international workers will kill many businesses, which will lead to JOB LOSS of US CITIZENS. This actually applies to research labs, too. 3/