But Trump told reporters his objections had nothing to do with race.
Critics of Trump didn't miss the racial tensions underlying the conflict.
Trump has had a history of engaging in racially fraught battles, from his promotion of the false story that the nation's first black president, Barack Obama was not born in the United States, to his campaign proposal to temporarily ban Muslims from the United States. He drew widespread condemnation last month for saying "both sides" were at fault for violence between white supremacists and their opponents during clashes in Charlottesville, Virginia.
More than half of Americans, or 52 percent, said in a September 2016 Marist Poll that sports leagues should require their players to stand for the national anthem.
"I'm not going to get into every potential hypothetical that every potential candidate may or may not have", Sanders said.
"It's a flawless example of where the president gets it right", said Christopher Ruddy, the CEO of Newsmax and a longtime Trump friend. "Celebrating and promoting patriotism in our country is something that should bring everybody together".More news: Donald Trump tweeted about an Iranian missile test
More news: Netanyahu praises work of IDF rescue team in Mexico
More news: Kris set to 'make money off Kylie's pregnancy'
The United States has not declared war on the Democratic People's Republic of Korea (DPRK), the White House said on Monday, in response to remarks of the DPRK's top diplomat.
"It's a ideal example of where the president gets it right", said Christopher Ruddy, the CEO of Newsmax and a longtime Trump friend, who said team officials and the news media were not in line with much of the country.
Kaepernick left the 49ers at the end of the season and remains unsigned, leading some to question whether National Football League owners had blacklisted the quarterback to avoid attracting controversy.
It has now been almost a week since President Donald Trump made NFL protests during the national anthem a huge national story, and judging by today's White House press briefing, it doesn't look like this story is going to die down anytime soon.
Lately, the President has strongly lambasted the players, their fans and the NFL.
Later that day, Trump signaled his approval of players and owners standing arm-in-arm on the field during the national anthem, and again criticized the act of kneeling: "Great solidarity for our National Anthem and for our Country", Trump tweeted.