Yes, you can contact either or both, though in my experience, the Senator's office has worked rather well. Also, consider setting up an InfoPass...

Likely, yes. You need to promptly consult a local attorney and seek redressal.

As a legal permanent resident, you may re-enter the United States without issue as long as you arrive with a valid green card and passport.

For protected records, such as military records, a court-signed subpoena is required; a subpoena signed by an attorney or clerk of court does not...

It may take a while, even a month, to be designated to a specific BOP facility after sentencing, and even more time after that to get to that...

It means that the case hasn't been filed yet. The prosecutors are gathering or lining up evidence. It's not unexpected.

The final sentencing decision lies with the judge, who has the authority to amend the terms of the plea bargain. So even though the judge is likely...

As you may know, one can only be convicted based upon evidence which has been lawfully searched for and seized by law enforcement. Even if...

His new attorney should be able to coordinate procuring any prior discovery.

Federal inmates serve 85% of their sentence. The Bureau of Prisons at https://www.bop.gov/inmateloc should give you a projected release date.