Biden to deliver presidential address amid heightened security

With security fences still surrounding the Capitol and continuing concerns over extremist threats, President Joe Biden's first joint address to Congress will take place under heavy guard -- though details remain murky. "Heightened security at the U.S. Capitol in advance of President Biden's remarks to the joint session ... underscores the ongoing threat from far-right extremists in the United States now more than three months after the insurrection on 6 January," Javed Ali, the former counterterrorism director on the National Security Council, told ABC News. Biden's speech comes just months after the deadly Jan. 6 insurrection when pro-trump demonstrators stormed the Capitol in an effort to stop the electoral vote count in Congress and less than a month after a Capitol Police officer was killed when a man rammed his car into a security barricade. Security concerns have also revolved around Biden's speech in particular. At a House Committee hearing in February, Acting Capitol Police Chief Yogananda Pittman warned of threats to disrupt Biden's speech to a joint session of Congress, which at that time was not yet scheduled.