League rules state NBA players, coaches and trainers must "stand and line up in a dignified posture along the sidelines or on the foul line" during the national anthem.
The rules don't say anything about the national anthem singer.
On Monday night, Leah Tysse took a knee as she performed the last lines of the anthem at the Sacramento Kings preseason opener at the Golden 1 Center.
The Berkeley resident's move did not go unnoticed online.
National anthem singer at the Kings game just took a knee!!— Kevin Fippin (@kfippin) October 11, 2016
The national anthem singer at the Sacramento Kings game took a knee for the final lines of the song.— Carmichael Dave (@CarmichaelDave) October 11, 2016
Tysse taking a knee comes after several weeks of professional athletes protesting the national anthem in various ways, including taking a knee.
The trend started with 49ers quarterback Colin Kaepernick during an August preseason game.
In a Facebook post, Tysse explained why she took a knee -- saying in part, "The sad reality is, as a white American I am bestowed a certain privilege in this nation that is not enjoyed by all people."
Why I took a knee while singing the Anthem at a Sacramento Kings NBA game: This act embodies the conflict many of us feel. I love and honor my country as deeply as anyone yet it is my responsibility as an American to speak up against injustice as it affects my fellow Americans. I have sung the anthem before but this time taking a knee felt like the most patriotic thing I could do. I cannot idly stand by as black people are unlawfully profiled, harassed and killed by our law enforcement over and over and without a drop of accountability. I believe that the majority of police are good and are against this too and as a nation we all need to speak up. We should all be outraged and demand justice and an end to the brutality. Let’s look around our communities for those facilitating healthy interactions between law enforcement and communities of color and support. The sad reality is, as a white American I am bestowed a certain privilege in this nation that is not enjoyed by all people. Black families are having much different conversations with their children about how to interact with the police than white families. Let's be honest. Until we can recognize that white privilege exists we cannot have a dialogue about race. Whether or not you can see if from your vantage point, there is a deep system of institutionalized racism in America, from everyday discrimination to disproportionate incarceration of people of color to people losing their lives at the hands of the police simply for being black. This is not who we claim to be as a nation. It is wrong and I won't stand for it.