Speaking on NBC's ``Meet the Press,'' Brennan said he's been contacted by a number of lawyers about the possibility of an injunction in the wake of Trump's move to revoke his clearance.

Leon Panetta said Trump should focus on more pressing issues such as healthcare and immigration.

Canada's opposition parties have spoken out against Harper's plans to take part in the bombing campaign against ISIS, expressing doubts about how effective coalition airstrikes are against the militant group.