WASHINGTON — The Department of Homeland Security issued a national terrorism bulletin Wednesday warning of the potential for lingering violence from people motivated by anti-government sentiment after President Joe Biden’s election, suggesting the Jan. 6 riot at the Capitol may embolden extremists and set the stage for additional attacks. The department did not cite a specific threat, but pointed to “a heightened threat environment across the United States” that it believes “will persist” for weeks after Biden’s Jan.