Richard Wilkerson hits the Republican senator with a stinging rebuke.
“No one has forgotten or will ever forget what you said and did," she tweeted, quoting the president's past insults against her late father, Sen. John McCain.
After a Senate seat win in 2018, Democrats hope the anti-Trump wave will deliver the state to their party in November.
The late Arizona senator's wife said that without her husband, Republicans are less likely to stand against Trump.
"He was very frustrated with what was going on then and I think now he’d be even more frustrated," she said.
"It’s really a way to honor a family that ... has shown that the country is bigger than any one individual,” said Peter Kauffmann of VoteVets.
In fact, McCain was a sponsor of the legislation and successfully pushed for the one feature Trump constantly takes credit for. Obama signed it into law in 2014.
The Republican National Committee's post received a frosty reception.
The hashtag went viral after Ellen DeGeneres' producer Andy Lassner called on Twitter users to honor "an American hero" on the president's 73rd birthday.
The protest group Led By Donkeys wants the U.S. president to know "the vast majority of people in this country don’t like him.”