On multiple occasions. Ed Morrissey reports that, if it’s true, Emanuel will probably show up on the FBI wiretaps.
It’s unlikely that anything stunning will show up, like clear and explicit financial negotiations over the seat. After all, Emanuel hasn’t been arrested by the feds. Then again, as Ed points out, it’s unlikely that Emanuel tipped off the feds, given the way he’s been running from the press.
The interesting thing will be whether any unsavory discussions came up that arguably generated a duty to inform Obama or the FBI. This could prove interesting.