BERLIN: Angela Merkel's hand-picked choice for the ceremonial post of president was expected to resign on Friday in a scandal over political favours, dealing a blow to the German chancellor in the midst of the euro zone crisis. Christian Wulff, who has been under fire for months, was to give a statement at 1000 GMT. Merkel abruptly postponed a trip to Rome where she was to hold talks with Italian Prime Minister Mario Monti, and scheduled a news conference for after Wulff speaks.