President Donald Trump plans to build an exhibit of statues featuring prominent Americans in a tightly regulated park along the Potomac River, potentially opening a new legal fight over whether his administration is ignoring the approvals process that typically governs Washington 's monumental core as he muscles through a dramatic overhaul of the nation's capital. In a Friday morning social media post, Trump said the National Garden of American Heroes would be built in West Potomac Park, a space near the National Mall that includes the Korean War Veterans Memorial, the Jefferson Memorial, the Franklin Delano Roosevelt Memorial and the Martin Luther King Jr. Memorial. The area is also home to several fields and volleyball courts regularly used by local sports groups.…