In celebration of Donald Trump’s 73rd birthday on Friday, thousands of Twitter users made the hashtag #JohnMcCainDay go viral in order to honor the late Republican senator and rival of the president.

The trend started when Andy Lassner, the executive producer of The Ellen DeGeneres Show suggested his followers commemorate the president’s birthday by making McCain’s name appear all over the social media site.

“I’m sure this would mean a lot to patriot like Donald Trump,” Lassner wrote.

Honoring an American hero today.

Let’s celebrate @realDonaldTrump’s birthday today by having #JohnMcCainDay trend.

I’m sure this would mean a lot to patriot like Donald Trump. #JohnMcCainDay

— andy lassner (@andylassner) June 14, 2019

McCain, a Navy veteran, longtime Arizona senator and two-time Republican presidential nominee, died in August 2018 after a yearlong battle with brain cancer. Trump repeatedly slammed the later senator during his final years in Congress and has continued to do so even after his death.

Their feud first began when Trump, who has been accused of lying about bone spurs to avoid the Vietnam War draft, said McCain was not a real hero because he was captured and taken as a prisoner of war during his time in the Navy. “I like people that weren’t captured,” Trump said on the 2015 campaign trail.

In March, nearly seven months after McCain’s death, Trump lamented that he didn’t get a “thank you” for giving the Republican icon “the funeral he wanted.” He then went on to blame McCain for the war in the Middle East and for not doing enough for veterans.

“I have to be honest: I’ve never liked him much, Trump said in his speech. “Hasn’t been for me. I’ve really—probably never will.”

A few weeks ago, the Trump administration was caught covering up the USS John S. McCain ship during the president’s visit to Japan. While Trump initially told the press that he had no knowledge of the cover-up, the Navy said in a statement that a “request” was made to keep the ship out of view.

“A request was made to the U.S. Navy to minimize the visibility of USS John S. McCain, however, all ships remained in their normal configuration during the President’s visit,” Rear Admiral Charlie Brown, chief of Navy information, said in a statement. “There were also no intentional efforts to explicitly exclude Sailors assigned to USS John S. McCain.”

Take a look:

PATRIOT 🇺🇸 > TRAITOR 🇷🇺

Maverick > Con Artist

War Hero > Draft Dodger

Honest man > Pathological Liar

American Hero > Putin’s Puppet

John McCain > Donald Trump#JohnMcCainDay

— Ryan Knight #ImpeachTrump 🍑 (@ProudResister) June 14, 2019

Real heroes are celebrated.! Happy #JohnMcCainDay pic.twitter.com/zpYV1Rfms3

— kitty (@kim97710687) June 14, 2019

I refuse to celebrate a draft dodger today. Instead today will be #JohnMcCainDay. And @andylassner would hate if you made it trend and it’s fun for him to hate things so please give a tweet to #JohnMcCainDay

— Tony Posnanski (@tonyposnanski) June 14, 2019

We had a lot of policy disagreements with John McCain and battles over use of military force. We never held back in our fights. But, we also always honored his sacrifice and heroism, in uniform. We still do. And that’s what we’re honoring, on this #JohnMcCainDay pic.twitter.com/oCEaf7uiXI

— VoteVets (@votevets) June 14, 2019

Happy John McCain Day! And flag day! 🇺🇸 That's it, nothing else today. #JohnMcCainDay pic.twitter.com/Gd5Hl3ezvj

— penny (@PennyDepp) June 14, 2019

Canadians love and respect True American Heroes.I did not agree with most of his political beliefs but I did and continue to respect the man, John McCain.#JohnMcCainDay pic.twitter.com/WgxGozVTjM

— Canada's Witch (@Scareesheree) June 14, 2019

For patriots everywhere, happy John McCain Day! #JohnMcCainDay pic.twitter.com/lmSz7Uxj9B

— Tami (Justice Time) Matthews (@geekgirlden) June 14, 2019