"Probationary employees receiving the email have been working at the agency for less than a year. The emails began to go out on late Wednesday afternoon, according to an EPA union official.
The same message will be sent to other agency workforces, a White House official said. Across the US government, the latest data shows there are more than 220,000 employees on probation."
https://whdh.com/news/epa-workers-receive-emails-warning-their-employment-could-be-terminated/
Don't know, but the states need to work it out between themselves. That's what the Constitution is for.
Yes. Interstate Compacts negotiated by two Governors. No need to involve the other 48 states.