(AP Photo/Mariam Zuhaib)WASHINGTON -- President Donald Trump's proposed 250-foot-tall (76-meter) memorial arch could disrupt the historical significance of dozens of sites near its planned location, according to an assessment by the National Park Service. One of the most obvious elements the report cited is that the arch would break alignment between the Lincoln Memorial, Memorial Bridge and Arlington House that was formerly Confederate Gen. Robert E. Lee’s home. The proposed arch is one of several projects the Republican president is pursuing to leave his lasting imprint on Washington. The arch design, proposed by Trump, has already received early approval from the U.S. Commission of Fine Arts. The arch is one of several projects Trump has proposed that is involved in litigation.