Anti-government militias & white supremacy has been mainstream Republican for some time.

Muslim databases and 'rabid dogs': Trump, Carson and GOP in explosion of rhetoric over Syrians 

The race for the Republican nomination for the White House took a new turn in the aftermath of the Paris terrorist attacks on Thursday as the front-runner, Donald Trump, called for a database to track Muslims living in the United States, while his closest rival, Ben Carson, suggested refugees of the Syrian conflict should be screened as they might be “rabid dogs”.

This is not a “new turn”. 

The white supremacy rhetoric coming from main stream Republicans took political journalists by surprise. But those of us who monitor right wing terrorists knew it was coming. We could see right wing extremism in the local Republican Party. We could see right wing extremism in Pennsylvania Republican Party politics. It’s been coming for at least a decade. 

Many people don't want to accept that the GOP has become white supremacist anti-government militia political party.