Lucas Aulbach | Courier Journal

Matt Stone/Courier Journal/USA TODAY Network

U.S. Sen. Rand Paul says he'll be sidelined from the Senate until September after undergoing lung surgery over the weekend.

Part of Paul's lung was damaged when he was assaulted by his neighbor in November 2017, the senator said Monday morning in a Twitter post.

He underwent an operation over the weekend at Vanderbilt University Medical Center in Nashville, Tennessee, to have the damaged part removed. Paul thanked the hospital's doctors, nurses and staff in his statement.

Paul said he would have to "limit (his) August activities" due to the surgery but planned to return to the Senate in September.

Paul went to Canada to undergo hernia surgery related to the assault in January 2019, saying at the time that he chose the Canadian facility over a similar medical center in Oklahoma because the hospital north of the border specialized in the hernia surgery and had a good price.

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It was a rough weekend for Kentucky's two U.S. senators. On Sunday, Sen. Mitch McConnell's office announced the state's senior senator had fallen at his Louisville home and fractured his shoulder. McConnell will continue to recover at home after being treated at a local hospital, his office said.