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Rob Astorino, newly-minted Republican candidate for governor, will speak in Buffalo at 3 p.m. today at Zeptometrix Corp., 878 Main St.

Astorino, the Westchester county executive who is the first officially declared GOP candidate to challenge Gov. Andrew M. Cuomo, will be joined by Rep. Chris Collins to help launch his campaign.

Astorino began this morning with an appearance on the steps of a Bronx courthouse, and will hold public events Friday in Rochester, Syracuse and Albany.

Billionaire and media celebrity Donald J. Trump is also considering a Republican run for governor.