Spain’s acting prime minister, Pedro Sánchez, is expected to be chosen by a majority of legislators to form a new government in a parliamentary vote Thursday. The vote comes at the end of nearly two days of debate among party leaders that centered almost entirely on a highly controversial amnesty deal for Catalonia’s separatists that Sánchez agreed to in return for vital support to get elected prime minister again. Barring any last-minute upsets, Sánchez has the support of six smaller parties, allowing him to reach the absolute majority of 176 lawmakers needed be...