ROLL CALL: Vitter’s Obamacare Probe Continues With Subpoena Vote.

Sen. David Vitter’s crusade against government contributions to congressional health care plans continues this week with a vote to subpoena documents from the D.C. government, but he may have some dissenters in the Republican ranks.

The Louisiana Republican is the chairman of the Senate Small Business Committee, and he has used his perch to investigate congressional enrollment in the District of Columbia’s small-business exchange, which allowed for a government contribution to congressional health care plans. But his investigation has some members questioning whether this is an issue for his committee.

“I’m not even confident it’s within the jurisdiction of the committee, so I still have serious questions about it,” Sen. Kelly Ayotte, R-N.H., told CQ Roll Call Wednesday. “I have two concerns: whether we have jurisdiction and whether that’s the proper role of this committee.”

Ayotte is one of 10 Republicans and nine Democrats on the committee who will vote Thursday on whether to subpoena the D.C. Health Benefit and Exchange Authority for un-redacted congressional applications to the small-business exchange. A recent taxpayer lawsuit obtained the applications, showing that the House and Senate claimed to have fewer than 50 employees and were also classified as “state/local government,” but the names of the House and Senate employees who verified the applications were redacted.

In February, Vitter asked House and Senate administrators to reveal which employees signed the applications, but administrators did not supply the information. So after months of unanswered requests — and an appeal to Speaker John A. Boehner, R-Ohio, for help — Vitter is making a last-ditch effort to force DCHBEA to comply by issuing a subpoena.

But to do so, Vitter either needs the support of ranking member Jeanne Shaheen, D-N.H., or from the majority of committee members. Shaheen confirmed Wednesday she is a “no,” so Vitter will likely need all the panel’s Republicans to support him.

Not sure why they wouldn’t go along here.