Saturday's shootout between the Secret Servbice and a deranged gunman near the White House marked the latest in a growing series of threats and security incidents involving President Donald Trump and senior administration officials, intensifying concerns about political violence.As investigators continue piecing together the incident, authorities said Nasire Best, 21, of Maryland, approached a Secret Service checkpoint near 17th Street and Pennsylvania Avenue NW at about 6 p.m. local time, removed a weapon from his bag and opened fire on posted officers.GUNMAN DEAD AFTER OPENING FIRE NEAR WHIT...
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