Former President Donald Trump’s adviser Stephen Miller blew up Tuesday on Fox News in response to Vice President Kamala Harris’ Philadelphia rally with her new running mate, Minnesota Gov. Tim Walz — and suggested the duo wants to turn America into Somalia’s capital city. “He is the biggest booster in the whole country for unlimited refugee resettlement,” fumed Miller, an infamous anti-immigrant crusader who was behind some of the Trump administration’s most controversial anti-migrant policies and now runs a legal group suing over government policies intended to promote racial equity. “That me…