Fire or suspend!"

Trump wrote on Twitter early Sunday.

“…NFL attendance and ratings are WAY DOWN.

Boring games yes, but many stay away because they love our country.

He’s fired!'”

Trump said, referencing players taking a knee during the national anthem to protest police brutality and injustice.

“You know, some owner is going to do that.

He’s going to say, “That guy that disrespects our flag, he’s fired.”

And that owner, they don’t know it.

They don’t know it.

They’ll be the most popular person, for a week.

They’ll be the most popular person in this country.”

Both teams locked arms during the national anthem on Sunday and many players kneeled as a sign of protest.

Protests were expected around the NFL in various forms.