WASHINGTON (AP) - The Congressional subcommittee that oversees the District of Columbia has called Mayor Vincent Gray to testify about his budget proposal.

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Gray and D.C. Council Chairman Kwame Brown will appear before the subcommittee Thursday morning.

The subcommittee is looking into the long-term sustainability of the district's finances.

Congress must approve the district's budget, and before the spending plan is submitted to Congress, the district's chief financial officer must certify that it is balanced.

The district faces a $322 million shortfall for the upcoming fiscal year. Gray has proposed closing that gap with a mix of cuts and new taxes, but several council members, including Brown, have balked at the prospect of raising income taxes on the city's wealthiest residents.