They are known as "Three Percenters," followers of a movement that has rallied against gun control efforts, patrolled the border with Mexico and recently begun confronting Muslim Americans.

Followers describe themselves as armed "patriots." But some of their leaders have been linked to threats and vandalism against lawmakers, police and Muslims. One member from Phoenix prompted an FBI alert in November after posting a Facebook video saying he was headed to upstate New York with guns to challenge a Muslim group.

The Three Percenters, who plan a protest at a mosque in suburban Dallas on Saturday, have expressed concerns about national security in waging anti-Muslim activities this year. It's unclear whether they've also been influenced by the provocative speech of Republican presidential candidate Donald Trump following the deadly Paris attacks.