The neighbor accused of tackling the USA senator Rand Paul while he was mowing his lawn faces a possible prison sentence after he pleaded guilty on Friday to the attack that left the politician with broken ribs and damaged lungs.
Boucher denied any political motivations in the attack.
A federal judge accepted a plea agreement from Rene Boucher on March 9, which means he is now convicted of the assault.
Boucher, who is Paul's neighbor, admits the fight was about yard maintenance.
Boucher had "had enough", ran downhill toward Paul - who was wearing headphones and only noticed Boucher at the last second - and tackled him. Instead, it had to do with a property dispute, the documents said.
The guilty plea gives up a right to appeal.
Rand Paul's attacker has pleaded guilty to assaulting the Senator on the front lawn of his Kentucky home.
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Paul suffered multiple broken ribs in the attack.
The case, which has been characterized as a property dispute between neighbors in the Rivergreen subdivision where the two men live, made national headlines in the wake of Boucher's arrest and provided fodder for late-night talk shows.
The episode had been "profoundly embarrassing" for Boucher, his lawyer, Matt Baker, said.
Rene Boucher, 59, was released on $25,000 unsecured bond and is due to be sentenced on June 15, said Kelly Lovell, a case manager for Kentucky's western district federal court.
A close friend of Paul's said the Republican senator had gotten off his riding lawnmower to remove a limb when he was tackled from behind. While prosecutors have recommended a 21-month prison sentence, Boucher can argue for the sentence he believes is appropriate.
He was ordered to stay 1,000 feet away from Paul and his family.
Boucher left the federal court building without speaking to reporters.