Arizona officials are threatening legal action to stop the Obama administration from moving hundreds of undocumented immigrants from Texas to their state after a surge of illegal border crossings swamped immigration officials in the Rio Grande Valley.

The U.S. Border Patrol has acknowledged flying hundreds of migrants from Texas to Tucson and Phoenix, where many have been dropped off at Greyhound bus stations. Last week, immigration agencies began sending hundreds of undocumented minors apprehended while crossing the border to a holding facility in Nogales.

Arizona officials say they were not notified before the transports began.

In a letter to the Department of Homeland Security, Arizona Attorney General Tom Horne (R) insisted the department’s border security units stop the transports.

MORE: http://www.washingtonpost.com/blogs/govbeat/wp/2014/06/14/arizona-republicans-threaten-action-over-immigration/