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Former President Joe Biden is undergoing a new phase of treatment for an aggressive form of cancer that was diagnosed in May, a spokesperson said Saturday.

"As part of a treatment plan for prostate cancer, President Biden is currently undergoing radiation therapy and hormone treatment," according to the spokesperson for the former president.

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The radiation treatment is expected to span five weeks and marks a new point in his care, a source familiar told NBC News. He has already been taking a pill form of hormone medication.

Last month, Biden, 82, also had a skin cancer treatment known as Mohs surgery. A large bandage on his forehead was visibl

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