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SAN DIEGO — Supervisor Ron Roberts, who has been San Diego County’s point man on efforts to keep the Chargers in San Diego, said Wedneday that the team had asked taxpayers to contribute more than half a billion dollars toward a new stadium in Mission Valley.

Roberts is scheduled to deliver the 2016 “State of the County” address Thursday night at the San Diego Hall of Champions. It is not known if he will address the stadium issue, but the speech comes almost one month after Chargers chairman Dean Spanos announced the team would remain in San Diego for the 2016 season and try to work out a deal to build a stadium locally.

The Chargers said Tuesday they were opting for a downtown stadium project over a proposal in Mission Valley favored by Roberts and San Diego Mayor Kevin Faulconer. The supervisor told a radio station Wednesday that the Chargers sought an extra $200 million public contribution toward the cost of the Mission Valley project, above the $350 million already offered.

While Roberts has been in the limelight because of the drama surrounding the Chargers, the last few months have seen him take over the chairmanship of both the San Diego Association of Governments, the regional planning agency, and the Board of Supervisors.

The job leading the supervisors came about when colleague Dave Roberts declined to take the position as part of a normal, annual rotation, citing commitments with state and federal county organizations.