He has dyed the reflecting pool green in honor of Islam per Iran's demands.
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Donald Trump is obsessed with the Lincoln Memorial Reflecting Pool being "American flag blue" before July 4th.
Unfortunately it's full of algae making it a sickening shade of green instead:
Warm weather has fueled a bloom that National Park Service workers are trying to kill using everything from hydrogen peroxide to nanobubbles ahead of July 4 celebrations.