President Donald Trump wants NFL players who kneel during the national anthem to see a tweeted photo of a woman lying next to her husband’s grave in a military cemetery, he said Thursday.

We stand to honor those who fought and died defending the greatest nation the world has ever known. God bless our vets! #MAGA pic.twitter.com/Oez8pI1lzZ — CoreyJones (@CoreyLMJones) September 16, 2017

How exactly the powerful Sept. 16 photo ended up on the president’s Twitter feed is unclear, but he immediately endorsed it.

So beautiful….Show this picture to the NFL players who still kneel! https://t.co/tJLM1tvbvb — Donald J. Trump (@realDonaldTrump) January 4, 2018

Trump has made repeated calls since October for NFL players to stand during the national anthem. The kneeling protests were first propelled by former quarterback Colin Kaepernick who wanted to protest violence against black citizens by police officers.

Trump has suggested the NFL change its rules to bar kneeling and has encouraged team owners to fire kneeling players.

Follow Saagar Enjeti on Twitter

Watch Sarah Sanders brag about SEC football: