The vice president's son Beau Biden died Saturday after battling brain cancer. He was 46.

Cruz then took to his Facebook page to apologize.

\"It was a mistake to use an old joke about Joe Biden during his time of grief, and I sincerely apologize,\" he said, according to the post. \"The loss of his son is heartbreaking and tragic, and our prayers are very much with the Vice President and his family.\"

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