Washington (CNN) The 30-day sentence Rene Boucher received for attacking Sen. Rand Paul was too lenient, the 6th US Circuit Court of Appeals ruled Monday, ordering a lower court to issue a new sentence.

The sentencing guidelines ranged from 21 to 27 months, and the three-judge appeals court panel agreed with the Justice Department that the sentence wasn't enough.

"Our review here reveals no compelling justification for Boucher's well-below-Guidelines sentence," the opinion states.

Paul was attacked at his home in Bowling Green, Kentucky, by his neighbor Boucher -- an anesthesiologist and former colleague of Paul's -- on November 3, 2017, leaving the senator with six broken ribs and bruised lungs.

Boucher pleaded guilty in March 2018 to one felony charge of assaulting a member of Congress resulting in personal injury. He was sentenced to 30 days along with a year of supervised release and a $10,000 fine.

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