Full context is available in a tweet linked in the article[1], but Jones states "We're under attack and you know that and you've pointed out that mainstream media is the enemy. But now it's time to act on the enemy... They're coming and they're coming and they're coming. They think they can really take down America. This is it." before urging his followers to have rifles ready.

[1] https://twitter.com/mmfa/status/1029477795561463808