German Chancellor Angela Merkel cancelled planned talks in Rome on Friday, as indications mounted that President Christian Wulff would resign.
Sources close to the president said Friday that he was to announce his resignation at a press conference scheduled for 11 am (1000 GMT), amid growing corruption allegations, DPA reported.
Public prosecutors on Thursday applied to lift Wulff's immunity following allegations over favours accepted from wealthy friends while he was premier of Lower Saxony state.
Merkel was to give a separate statement Friday at 11.30.