New Delhi, June 14 -- With his approval ratings at a second-term low and his rural base fracturing over fuel and food prices, Donald Trump has turned his most sustained attention not to diplomacy or legislation but to concrete and marble - pursuing a campaign to physically transform the nation's capital that includes a 250-foot triumphal arch on the Potomac, a new grand ballroom inside the White House, and a series of renamings and demolitions that critics say bear the hallmarks of authoritarian aesthetics rather than democratic public works. NPR reported on newly released architectural plans for the arch in April, revealing the full scale of a project that has drawn sustained opposition from preservationists, veterans, and urban planners...