Democratic presidential candidate Bernie Sanders if off the trail Monday because he is undergoing an elective surgery to have his hernia repaired at George Washington University in Washington D.C, according to his Senate staff.

The outpatient surgery will be minimally invasive, as the senator will resume his duties on Capitol Hill on Tuesday. But Sanders will not return to the campaign trail until next week as he will spend the rest of the week working from his Capitol Hill office.

The 74-year-old Vermont senator is the oldest candidate on the primary campaign trail in either party. Democratic front-runner Hillary Clinton is only five years his junior and she has previously released her most recent medical records to prove to the public that despite her age, she is fit to serve as president.

Sanders, who has been known to give energetic two hour speeches in front of large crowds, appears to be in good health but has yet to release any medical records.

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