A group of NFL moms wrote an open letter to Donald Trump urging him to drop the “divisive language” when referring to NFL players and their protests during the national anthem.

“[We] believe in promoting a positive image of professional football players as athletes and young men of character,” the letter reads, according to BuzzFeed News. “It saddens the organization to know that President Donald Trump would make our sons – as well as their mothers – the target of inflammatory, offensive comments that are intended to promote anger and hatred, depleting them of their heritage and self-identity.”

“Whether it be by kneeling or standing with their arms locked, our sons have chosen this platform to get the message out about social justice and unity, and they will always have our support,” the letter continued. “Now that we obviously have your attention, let’s put a stop to the divisive language and start a productive dialogue for positive change.”

The letter was written by the Professional Football Players Mothers Association (PFPMA), a support system for the mothers of professional football players, and was written in response to Trump’s comments during a rally last week in which he criticized the players who were taking a knee during the national anthem and called anyone participating in such a protest a “son of a b****.”