Gov. Greg Abbott has asked a federal judge to reject Minnesota's effort to force the extradition of an immigration officer arrested in Texas, saying he has "serious concerns" whether the officer is actually a fugitive from justice.

Abbott said state officials are still investigating whether Christian Castro, who is being held in Cameron County Jail, can be classified as a fugitive because he didn't flee Minnesota but was apparently reassigned to Texas by Immigration and Customs Enforcement.

Abbott's response came nearly a week after Minnesota officials filed a federal lawsuit to compel the extradition of Castro, who faces four counts of second-degree assault and one count of falsely reporting a crime after allegedly injuring a Venezuelan man earlier this year during Operation Metro Surge - a massive immigration crackdown in Minneapolis - and lying about what led up to the shooting.