BERLIN—The German government is preparing the way for the country’s troops in Afghanistan—the second-biggest contingent in the NATO force—to stay in place until next year if needed. Chancellor Angela Merkel’s Cabinet on Wednesday approved a new draft mandate that would enable German troops to stay until Jan. 31, government spokesman Steffen Seibert said. German troop deployments overseas require parliamentary approval, which is typically granted on an annual basis. The current mandate for Afghanistan expires at the end of March. NATO has just under 10,000 troops in the war-ravaged country, helping to train and advise Afghan security forces. Germany’s contingent of nearly 1,100 is the second-biggest in the Resolute Support mission after the United States. President Joe Biden is reviewing his predecessor’s 2020 deal with the Taliban, which includes a May 1 deadline for a final U.S. troop withdrawal. In Washington, calls are mounting for the United States to delay the …