Nearly 150 people, including retired senior military officers, lawyers and academics are on trial for alleged links to a shadowy organization called Ergenekon.
Senator Ferguson subsequently reviewed his position and in his letter of apology, stated that he was "deeply sorry" as his speech was never intended to cause "distress".
The Conference focuses on the adverse impact the ongoing global economic and financial crisis may have on Armenia's ability to achieve the Millennium Development Goals (MDGs) by 2015.