Meghan McCain shares 'after-dinner talk with dad' photo

"Last night in beautiful #Arizona with @MeghanMcCain," Sen. McCain tweeted.

Wearing a bird-watching T-shirt and a Navy baseball cap, the chairman of the Senate Armed Services Committee is seated outside with Meghan, 32, at a table lit by candlelight.

"In accordance with the guidance of his physicians, Senator McCain is returning to Arizona to undergo further treatment at Mayo Clinic," his office said in a statement released July 28. "On Monday, July 31, he will begin a standard post-surgical regimen of targeted radiation and chemotherapy. During that time, Senator McCain will maintain a work schedule. He plans to return to Washington at the conclusion of the August recess."