Sheer nonsense. Hamas is the elected government. Hanyiah is the Prime Minister of the PA, just as Abbas is the President. Any negotiations will have to bind the PA as the elected government. If Hamas will not accept Oslo, the matters agreed to might not be agreed to in the future. Israel can play hardball, too.
Bennett, Deri expected to resign from Knesset, remain in cabinet under new 'Norwegian Law’ (Haaretz)
from the article: Arab leaders rule out amending Saudi proposal