HARDtalk’s Stephen Sackur speaks to Jens Spahn, a rising star in Chancellor Merkel’s Christian Democratic Union. With so much focus on America's new president, it's easy to forget Europe is facing its own period of prolonged uncertainty. Brexit negotiations are about to begin, the Greek debt crisis is going through another convulsion. It is also a year of key elections, most particularly in the continent's dominant economy, Germany. Is German politics going to reshape Europe?