Sen. John McCain said Thursday he is holding up President Trump's pick for Army secretary and other nominees partly to get answers about recent soldier deaths in Niger. McCain, R-Ariz., added the Oct. 4 ambush by ISIS-aligned fighters in West Africa that killed four soldiers to the list of military briefings his Armed Services Committee wants from the Trump administration in exchange for moving Defense Department nominees. The DoD has launched an investigation of the incident in Africa and plans to release the findings to Congress, Lt. Gen. H.R. McMaster, Trump's national security adviser, said Thursday. The Armed Services chairman...