Excavation work will begin over the next two weeks on a site where the Trump administration plans to build a tall memorial arch in Washington, D.C., a project that faces a lawsuit from opponents who argue the project will disrupt nearby historic sight lines.Interior Secretary Doug Burgum announced Thursday that work would start on the Great Triumphal Arch and Military Observation Deck, which will be located on Columbia Island, standing between the Lincoln Memorial and Arlington National Cemetery."This will be one of the Great Pieces of American Architecture, honoring the history and significan...