San Antonio Mayor Gina Ortiz Jones speaks to reporters after a recent town hall.

Credit: Jacob R. Lopez San Antonio Mayor Gina Ortiz Jones is calling for a citywide vote on Project Marvel as a looming budget deficit and lower-than-expected revenue cloud the city's economic outlook and its ability to issue bonds.

Late Friday, Jones sent a memo to City Council, City Manager Erik Walsh and City Attorney Andy Segovia, calling for the city's $489 million contribution toward a new basketball arena for the Spurs at Hemisfair to be added to the November ballot.