Washington (AFP) – The conspiracy that drove a mob to attack the US Capitol in January 2021 still poses a threat to American democracy, the head of the congressional committee tasked with investigating the deadly riot will warn Thursday at the panel’s first public hearing. In a live prime-time presentation, the committee will offer the first conclusions from a year-long probe into the assault — and seek to outline a deep-rooted and ongoing plot to undermine the US Constitution and overturn Donald Trump’s election defeat. The hearing will serve as an “opening statement” on the January 6 insurr…