WASHINGTON — The Northern Virginia Transportation Authority’s ability to impose taxes and issue bonds remained uncertain yesterday after the Virginia Supreme Court heard oral arguments in a case that could have a far-reaching effect on other regional authorities in the state.

The case pits the NVTA, supported by Virginia’s governor, state attorney general, and speaker of the House, against the Loudoun County Board of Supervisors and a group of 18 Virginia residents, which claim that the authority’s proposals to levy taxes and issue debt violates the state’s constitution. The residents are called the Marshall defendents because they are led by Republican House Delegate Robert Marshall.

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