The leadership of Germany’s Social Democratic Party (SPD) said it does not rule out the possibility of banning the far-right Alternative for Germany (AfD) party, although it said this should be a last resort. It should be “a clear option” to examine the unconstitutionality of the AfD if the findings by the intelligence service make the chances of success of such proceedings appear certain, according to a resolution passed by the SPD leadership on Saturday. The classification of the AfD as a suspected right-wing extremist group by Germany’s domestic intelligence service is the subject of an ong…