Homeland Security Secretary Jeh Johnson said Sunday that the United States is facing a new era in which a lone-wolf terrorist could “strike at any moment.” “We’re very definitely in a new environment, because of ISIL’s effective use of social media, the Internet, which has the ability to reach into the homeland and possibly inspire others,” Johnson said in an interview with ABC’s “This Week,” using the administration’s preferred acronym for the Islamic State in Iraq and Syria (ISIS). “Because of the use of the Internet, we could have little or no notice in advance of an independent actor attempting to strike.”

As a result, Johnson said, the federal government is making a greater effort to engage with state and local law enforcement and encourage them to be “vigilant” about what is happening in their communities. Part of this effort is meeting with Muslim community leaders and urging them to counter ISIS’s recruitment campaign on social media, which Johnson called “slick” and “effective.” Lawmakers and experts have been critical of the federal government’s attempts to challenge that campaign, with Sen.

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Cory Booker (D-N.J.) reportedly calling the efforts “laughable.” Johnson took issue with this description, but acknowledged that community leaders are in the best position to reach out to individuals which might be vulnerable to radicalization. MORE