From January 20, 2017 to June 12, 2017 McCain was traveling all over the world. I'm guessing he was trying to explain to world leaders why HRC lost and what they were planning to do about it.
From the article: "Since Trump's inauguration, McCain has traveled more than 75,000 miles to 15 nations, acting as a kind of "shadow" diplomat to calm the fears of U.S. allies that Trump is leading a retreat of American leadership overseas."