STORY: Waving Spanish flags, supporters of the opposition conservative People's Party (PP) travelled from across Spain to attend the rally in Madrid. Authorities estimated the size of the crowd at 40,000.Sanchez, who came second in an election in July, could stay in office if he wins the support of exiled former Catalonia leader Carles Puigdemont, whose Junts per Catalunya party controls seven seats in parliament.Puigdemont, wanted in Spain for attempting the region's secession, has demanded that legal action be dropped against fellow separatists as a condition for his support.Sanchez held his own political rally in Gava, near Catalonia's regional capital Barcelona, on Sunday. He did not mention an amnesty but said the Socialists wanted to heal social divisions over the Catalan crisis.