The Director of National Intelligence, the Director of the FBI, the Director of Homeland Security... are all presidential appointees. In the case of the current individuals in those roles, like James Clapper, they will either retire or be fired shortly after Trump assumes office.

Each of them owes his career and livelihood to Barrack Obama. And each of them would willingly fall on his sword for the president. And if Barrack Obama wanted them to say that Martians had interfered with the US election, they'd do so. He isn't just their boss and mentor, he's their commander-in-chief.