Washington (CNN) - Few Americans know the name David Simas. But the White House political adviser has become the latest flashpoint in the continuing battles between the White House and House Oversight Committee Chairman Darrell Issa.

Late last week, Simas was subpoenaed by Issa's committee to testify about his duties as the White House Director of Political Strategy. Issa is demanding to know whether Simas' activities are in violation of the Hatch Act, which bars most federal employees from engaging in partisan political activities.

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