Are the "Six Assurances" still a Cornerstone in US-Taiwan Relations?

There are a number of questions following the recent Senate Foreign Relations East Asian and Pacific Affairs Subcommittee Hearing on U.S. policy towards Taiwan that took place two weeks ago that were left unanswered. Perhaps the most prevalent of these questions is if current U.S. policy towards Taiwan still includes the Six Assurances doctrine as one its primary components.  My full letter to the Taipei Times that was printed today can be viewed here.