U.N. Secretary General António Guterres expressed concern on Wednesday about Israeli Prime Minister Benjamin Netanyahu's plan to annex parts of the West Bank if re-elected, saying it would be illegal and gut prospects for regional peace. 'Such steps, if implemented, would constitute a serious violation of international law,' he said in a statement. 'They would be devastating to the potential of reviving negotiations and regional peace, while severely undermining the viability of the two-State solution.'