BERLIN (Reuters) - German Chancellor Angela Merkel’s Christian Democrats (CDU) will choose a new leader in mid-January, the party’s general secretary said on Saturday after a Dec. 4 party congress was postponed due to the resurgent coronavirus pandemic.The decision on Monday to postpone the choice of a new leader had stoked internal divisions in the party, with one candidate - Friedrich Merz - accusing some in the CDU establishment of opposing him for the job. The party’s three leadership candidates - Merz, Armin Laschet and Norbert Roettgen - have agreed to hold the congress in mid-January, CDU general secretary Paul Ziemiak announced on Twitter. “Unity in the CDU is important for Germany, particularly in such difficult times,” Ziemiak said, adding that the candidates all prefer a meeting in person, but if that is not possible, they appeal for an online meeting with digital voting.