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U.S. Sen. Patrick Leahy of Vermont was hospitalized as a precaution on Thursday after the 82-year-old was “not feeling well,” his office said in a statement.

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Leahy fell ill at his home in McLean, Virginia, The Associated Press reported. He was taken to a Washington-area hospital for tests and was expected to remain overnight, according to the news organization.

Leahy, as Senate president pro tempore, is third in line to the presidency behind the vice president and speaker of the House. The eight-term senator announced his impending retirement last year and his seat will be decided in next month’s election, The Hill reported.

Leahy is the longest-serving sitting senator. When he retires in January, Leahy will have served 48 years in the Senate, the AP reported.

The Democrat is the third longest-serving senator in U.S. history, CNN reported. Robert Byrd of West Virginia served for 51 years, 5 months, 26 days; and Daniel Inouye of Hawaii served 49 years, 11 months, 15 days.

Leahy was hospitalized In June after he fell and broke his hip, the AP reported. He underwent a second surgery on the hip in July.