>> this is a new world. the terror threat has metastasized across the world, well beyond afghanistan. the fundamental obligation of a president in my opinion is to defend and protect america. not against threats of 2001, but against the threats of 2021 and tomorrow. >> paul: president biden defending the u.s. withdrawal from afghanistan and claiming the terror threat has evolved since the u.s. was attacked on september 11th, 2001. so how has the nature of the jihadist threat changed over the last 20 years? and what does the new taliban government in afghanistan and its close ties to al qaeda mean for our terror-fighting