MLB Commissioner Bud Selig already knows the fate of Yankees third baseman Alex Rodriguez. Unfortunately, he wouldn't reveal all the details during his appearance on David Letterman's "Late Show" Monday night.

When asked by Letterman if Rodriguez would be suspended Selig said, "I'd rather not say." However, Selig did say he knew what would happen to the Yankees slugger. Rodriguez is currently under investigation by the league along with about 20 other MLB players, for allegedly using performance-enhancing drugs from Anthony Bosch's Biogenesis clinic.

Selig described the investigation as "thorough" and "tough" while being interviewed by Letterman. We should find out relatively soon just how tough the investigation has been for Rodriguez.

Watch video of Bud Selig on the "Late Show" below.

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