Tech #JohnMcCainDay: How people on Twitter are commemorating Trump’s 73rd birthday June 14, 2019June 16, 2019Dalvin Brown, USA TODAYComments Off on #JohnMcCainDay: How people on Twitter are commemorating Trump’s 73rd birthday On Friday, President Donald Trump was criticized by people on Twitter using the hashtag #JohnMcCainDay in honor of the late Senator.