The U.S. will not make the mistakes of the past and will ensure that a "robust" mechanism is set up to establish North Korea's complete, verifiable, and irreversible denuclearization (CVID), Secretary of State Mike Pompeo told press on Monday.Speaking to press at the U.S. Television Pool press center in Singapore on the eve of a historic meeting between U.S. President Donald Trump and North Korean leader Kim Jong Un, Pompeo also insisted that CVID remained the only outcome his country would accept."Many Presidents have signed off on pieces of paper only to find out the