McCain's daughter says Trump's reference to dad was hurtful

FILE - In this May 3, 2014 file photo, Meghan McCain, and Sen. John McCain attend the White House Correspondents' Association Dinner in Washington. Meghan McCain says that President Trump’s reference at a conservative conference last week to her father’s vote on a health care bill was "incredibly hurtful." She said she was naive to believe, after talking to president last year, that attacks on her father would end. Meghan McCain spoke on "The View," where she appeared with her mother Cindy. (Photo by Evan Agostini/Invision/AP, File)

Evan Agostini

PHOENIX  — Meghan McCain says she's "cautiously optimistic" that Sen. John McCain could return to Washington by the summer.

Meghan McCain told KTAR-FM on Tuesday that her father is doing well as he continues to undergo treatment in Arizona.

The 81-year-old Republican senator has been battling a rare and aggressive form of brain cancer called glioblastoma. He was diagnosed last summer.

John McCain was hospitalized and treated for a viral infection in December. He has remained at his family's ranch near Sedona to undergo chemotherapy and physical therapy since mid-December.

Meghan McCain says her father has been working through the side effects of chemotherapy, but she feels "very lucky that he is doing so well."

The senator had initially expected to return to Washington in January, but was unable to do so.