INA sec. 241(a)(4)(A) which states: (4) Aliens imprisoned, arrested, or on parole, supervised release, or probation.- (A) In general.-Except as provided in section 343(a) of the Public Health Service Act (42 U.S.C. 259(a)) and paragraph (2), the Attorney General may not remove an alien who is sentenced to imprisonment until the alien is released from imprisonment. Parole, supervised release, probation, or possibility of arrest or further imprisonment is not a reason to defer removal.