Words: Hope Schreiber
The First Daughter didn't place her right hand over her heart while the United State's national anthem was played.
Trump, 37, was attending the event as the guest of Queen Elizabeth who’s hosting President Donald Trump and various members of his family and administration, when she failed to show proper etiquette during the playing of "The Star-Spangled Banner."
According to the Flag Code, when the national anthem is played, "all present except those in uniform should stand at attention facing the flag with the right hand over the heart."
Despite the Flag Code never actually being enforced, and there is no punishment for not abiding by it, many on social media called out the president's daughter for failing to cover her heart.
The incident is reminiscent of a similar blunder made by the president in April 2017. During the White House Egg Roll, President Trump was filmed not covering his heart with his hand while the anthem was played.
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His wife, Melania Trump, helpfully nudged him to remind him to place his hand on his heart.
During the 2008 election campaign, President Barack Obama also fell victim to not knowing the code. The then-senator explained, "My grandfather taught me when I was two. During the Pledge of Allegiance, you put your hand over your heart. During the national anthem, you sing."