The gravesite of former President John F. Kennedy at Arlington National Cemetery sits on the same axis as the Lincoln Memorial (seen in the distance). Kennedy's relatives say Trump's 250-foot arch would not only disrupt the view between the monuments, but cast a shadow over his grave. Jewel Samad/AFP via Getty Images hide caption

Jewel Samad/AFP via Getty Images

One of America's most prominent political dynasties has waded into the growing fight against President Trump's proposed arch in Washington, D.C.

Nine members of the Kennedy family filed suit in federal court on Tuesday to block the 250-foot structure, saying it would