Washington (AFP) – The arrest of 13 men in a plot to kidnap the governor of Michigan and “instigate a civil war” placed a fresh spotlight on the growth of armed, right-wing extremist “militias” under the administration of President Donald Trump.The FBI says such groups constitute the greatest domestic terror threat to the country, but Trump has appeared to encourage some, leading to worries of political violence around the November 3 presidential election.Who are the militias?A subculture of armed right-wing groups with varied motivations has long existed in the United States. After Trump came…