Alex Morgan joined Megan Rapinoe as both U.S. women's national team stars opted not to sing the national anthem before Friday's quarterfinal match against France. 

Rapinoe previously protested in France by not putting her hand over her chest and later stated that she is "not going to the f—ing White House" if they won.

She caught the attention of President Donald Trump, who  tweeted , in part: "Megan should never disrespect our Country, the White House, or our Flag, especially since so much has been done for her & the team. Be proud of the Flag that you wear. The USA is doing GREAT!"

READ | Who is Megan Rapinoe, the US football star who has triggered Donald Trump

Morgan also has been outspoken about Trump's administration, and said in May she wouldn't attend the White House if she were invited.

“We don’t have to be put in this little box,” Morgan told  then. “There’s the narrative that’s been said hundreds of times about any sort of athlete who’s spoken out politically. ‘Stick to sports.’ We’re much more than that, OK?”

Morgan, along with Rapinoe, was met with a mix of reaction on social media: