Members of the Kennedy want to stop a new building project.
President Donald Trump plans to a tall in the nation's capital.
Nine people from the famous political group went to court.
They say the large project will hide the view of John F Kennedy's grave.
The site sits in Arlington National Cemetery in Virginia.
Thousands of soldiers are buried there too.
A paused the work for 14 days.
The government wants to this monument for the country's 250th anniversary.
However, the relatives argue that the tall tower will bring unwanted shadows.
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