BRASILIA (Reuters) – Fiscal responsibility will not be negotiable if leftist leader Luiz Inacio Lula da Silva wins next Sunday’s presidential runoff vote, Lula’s running mate Geraldo Alckmin said on Monday. Lula, who leads opinion polls by a narrowing margin over right-wing incumbent Jair Bolsonaro, has faced pressure to flesh out his economic program, especially the fiscal rule that would replace a constitutional spending cap, which he has said he would abolish. Former Sao Paulo governor Alckmin did not elaborate on the new fiscal anchor. “The first point is fiscal responsibility, which is no…