Rene Boucher was somber in court, keeping his head down as he was arraigned in Bowling Green on fourth-degree assault charges.
Earlier this week, U.S. Senate Republican leader Mitch McConnell said Paul would return next week.
The senator tweeted Wednesday that he sustained six broken ribs had and fluid buildup around his lungs.
He faces a maximum penalty of a year in jail if convicted. "Paul is doing well and that these two gentlemen can get back to being neighbors as quickly as possible", read the statement.
A longtime neighbor accused of assaulting U.S. Sen. The county prosecutor has suggested that criminal charges may change because of the severity of the lawmaker's injuries.
The Kentucky doctor who allegedly attacked Sen. "Anyone claiming otherwise is simply uninformed or seeking media attention".
Baker added that Boucher has been interviewed by US Capitol Police, who he said were interested in whether the incident was politically motivated.More news: Remy Ma Drops 'Wake Me Up' Featuring Lil Kim
A pre-trial court date was set for November 30 by Warren County District Judge Brent Potter, ABC News reported.
Paul writes on Twitter Wednesday: "I appreciate all of the support from everyone".
Citing unnamed sources, Fox News reported on Thursday that Paul had been told federal charges could be filed in the case, which could indicate that politics was behind the incident.
In a report Monday evening, The New York Times spoke with neighbors and three Kentucky Republicans familiar with what had transpired. The report also said "the defendant admitted going onto Paul's property and tackling him".
Baker says the attack had "nothing to do with politics".
Dr. Rene Boucher admitted to police that he tackled Paul from behind while he was mowing his lawn last Friday.
Paul and Boucher have been neighbors for 17 years in a gated community in Bowling Green.