Arizonas Democratic congressional delegation on Friday asked congressional homeland security leaders to open a formal investigation into the Department of Homeland Security, saying a recent Tucson immigration operation revealed a troubling pattern of abusive conduct and obstruction of independent journalism and congressional oversight by the U.S. Department of Homeland Security.

The letter, led by Rep. Adelita Grijalva and joined by U.S. Sens. Mark Kelly and Ruben Gallego and Reps. Greg Stanton and Yassamin Ansari, was sent to the chairs and ranking members of the House and Senate Homeland Security Committees. It follows a Dec. 5 operation in Tucson, when federal agents executed search warrants at Taco Giro and other locations across southern Arizona as part of a probe that led to dozens

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