September 23, 2013
The President called Chancellor Merkel today to congratulate her on the Christian Democratic Union's success in the German federal election on September 22. The President noted his deep appreciation for Chancellor Merkel's friendship, leadership, and steadfast support of the transatlantic relationship. The President and Chancellor Merkel agreed to continue their close cooperation on key issues of regional and global concern.
Barack Obama, Readout of the President's Call with Chancellor Merkel of Germany Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/304743