...+ We are affirming our 'A/A-1' long- and short-term issuer credit ratings on National Bank of Canada. + We are revising our business position assessment to "adequate" from "moderate", and our risk position assessment to "adequate" from "strong". + The negative outlook reflects the possibility that we might reduce the additional uplift of one notch included for extraordinary government support. TORONTO (Standard & Poor's) June 11, 2015--Standard & Poor's Ratings Services today said it affirmed its 'A' long-term and 'A-1' short-term issuer credit ratings on National Bank of Canada. The outlook is negative. In addition, Standard & Poor's revised its risk position assessment on NBC to "adequate" from "strong" and its business position assessment to "adequate" from "moderate". "Our long-term issuer credit rating on NBC is based on the bank's 'a-' stand-alone credit profile, combined with one notch of uplift reflecting our expectation that NBC would benefit from extraordinary government support...