Hamas’ exiled political chief warned Palestinian leader Mahmoud Abbas on Wednesday not to make leadership changes without consulting the militant group, taking a hardened stance ahead of negotiations to form a new government.Khaled Mashaal’s strong warning may have been in response to Palestinian press reports that Abbas planned to appoint his current interior minister, Nasser Youssef, as deputy commander of Palestinian security forces. That would enable the Palestinian leader to keep control over the forces. Full Story