The request underscores the continuing concerns about security and the potential for violence at the Capitol, two months after rioters breached the building in violence that left five people dead. And it comes as law enforcement was on high alert Thursday around the U.S. Capitol after intelligence uncovered a “possible plot” by a militia group to storm the building.

The potential plot is tied to the far-right conspiracy theory promoted by QAnon supporters that former President Donald Trump will rise again to power on March 4, the original presidential inauguration day.

U.S. Rep. Elissa Slotkin, D-Mich., said she learned that the request for a 60-day extension was made in the last 36 hours, and that the Guard is now seeking volunteers from states around the country to fill the need.