Washington — A British filmmaker who interacted with the leaders of two extremist groups charged with the most serious of crimes stemming from the Jan. 6 assault on the Capitol is set to testify before the House committee investigating the attack at its first public hearing on Thursday.Nick Quested, of Goldcrest Films, confirmed to CBS News that will be called to testify as a witness during Thursday's primetime proceedings. Quested will likely face questions about the footage he shot both on the days leading up to Jan. 6 and on the day of the attack, when he followed a group...