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Sen. Joe Lieberman (I-Conn.) on Monday issued the first congressional subpoena of the Obama administration.

It’s rare for Congress to subpoena an administration controlled by the same party  and, in doing so, Lieberman followed through on a threat he made last week. The senator, an Independent who caucuses with Democrats, has increasingly become a thorn in the side of the administration.

He has accused the administration of stalling a congressional probe into the November shootings at Fort Hood, Texas, saying the departments of Defense and Justice have turned down four requests for documents over the course of five months.

Last week Lieberman said he would take the White House to court over the issue of whether to share information about the murders, allegedly committed by Maj. Nidal Hasan.

Read More: By J. Taylor Rushing and Roxana Tiron, The Hill

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