Latest plans call for 250 life-size statues, reflecting pools, dining facilities and an amphitheater at West Potomac Park near the National Mall.
Administration estimates say the statues alone could exceed the $40 million approved by Congress, and the enlarged project may require significant redevelopment of the mostly sports-field site.
Construction has not begun, raising doubts about completion before the end of Trump's second term and possible ethical concerns if donor funding is sought.
How will this massive park reshape one of D.C.'s most historic public spaces for future generations?
With costs soaring and a tight deadline, how will the American Heroes garden be financed and built?
Who decides the final list of American heroes, and what does the eclectic mix reveal about its purpose?