As a senior official put it, "Trump's army constitutes the greatest threat of violence domestically, politically, that's the reality."
Here we have the FBI causing disunity by splitting the US population into half. The good half are the Democrats. The bad half is comprised of traditional Americans who want their country back from the special interests and support Donald Trump. It is the FBI that has made this division, not the people who want their country back. The FBI has proved itself to be a dangerous domestic terrorist that has created disunity among the population and gone to war against the traditional American population.
How can the FBI permit such a deadly threat to America, as the FBI declares Trump and his supporters to be, to win the election? How can an army of domestic terrorists be allowed to vote Trump into office? The FBI has equated Trump's election with an insurrection, that is, with the overthrow of the government.
This would seem to commit the FBI to preventing Trump's election, and the FBI is applying "counterterrorism methods developed over the past decade in response to Al-Qaeda and other Islamist groups" to Trump supporters. In other words, the FBI doesn't differentiate between Trump and his supporters and Muslin terrorists.