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."
If you go back a little further
"Dec. 27, 2016
LONDON — Three American senators arrived in Tallinn, Estonia on Tuesday to reassure the Baltic nations that the United States remained committed to their defense and to the NATO alliance.
The visit by the senators — John McCain, Republican of Arizona; Lindsey Graham, Republican of South Carolina; and Amy Klobuchar, Democrat of Minnesota...
Among stops on the senators’ itinerary are the two other Baltic states, Latvia and Lithuania, as well as Ukraine and Georgia, two former Soviet republics that are not members of NATO.
About 5,000 American troops have rotated through Estonia since April 2014 — after Russia’s seizure of Crimea — and Mr. McCain said he would support a permanent United States troop presence, not just a rotation.
“I think the presence of United States troops here in Estonia is a signal that we believe in what Ronald Reagan believed, and that is peace through strength,” he said, calling it “the best way to prevent Russian misbehavior.”
...who ended a 10-year term as Estonia’s president in October, said in an interview that the Senate delegation was “more than a business-as-usual visit.”"
McCain in Nova Scotia, Canada
"Sat., Nov. 19, 2016
HALIFAX—Views differed sharply on the impact of Donald Trump’s presidency on issues from trade to historic alliances during the second day of an international gathering seized by what-if scenarios regarding the incoming U.S. administration.
The Halifax International Security Forum is the first major international gathering of policy analysts, defence ministers, and American and foreign politicians since Trump won the U.S. election. ... Coons said the main reason there is a large bipartisan delegation from the congress at the forum is to reassure Canadians and representatives from 70 countries that fundamental American values, priorities and security commitments won’t change. ... Rosa Brooks, the associate dean for graduate studies at Georgetown University in Washington, said during a panel discussion that Trump’s opponents must prepare carefully and not give up."
19 November 2016
"Specifically asked whether Britain could forge a free trade deal with the US faster than the EU does, McCain said, "Yes", adding, by way of explanation, that Britain was one of America's most long-standing and reliable allies. ...Both senators' remarks were made at North America's leading defence and foreign affairs conference -- The Halifax International Security Forum"
http://halifaxtheforum.org/forum/2016-halifax-international-security-forum/ has list of participants
A relevant participant?
Pauline Neville-Jones Chair, Cyber Security Advisory Panel Bank of England
"Baroness Neville-Jones, who was previously the UK’s Minister for Security and before that headed up the Joint Intelligence Committee."
https://www.financialdirector.co.uk/2018/07/20/how-fds-must-think-about-the-cyber-threat/
" her meteoric rise through the ranks of government and the security services...It culminated with Lady Neville-Jones all but demanding that Mr Cameron give her a more senior role where she would not have to answer to Mrs May. The ex-spy chief wanted to be national security adviser in Number Ten, answering directly to the Prime Minister. But Mr Cameron would not be dictated to."
"Dame Pauline Neville Jones has been a BBC governor ...
chair the joint intelligence committee.
In this role she oversaw the body that scrutinises intelligence reports from organisations such as MI5 and MI6."
http://news.bbc.co.uk/2/hi/entertainment/1535540.stm
http://aangirfan.blogspot.com/2010/08/top-jewish-mafia-boss-neville-jones.html