Brennan had been interrogating Graham on whether he endorsed Kash Patel to become the next FBI director despite several questions raised by US lawyers and national security veterans who have worked with him.

For the ocasion, the Federal Aviation Administration (FAA) implements extensive security measures affecting commercial, general, and military flights before, during and after the presidential inauguration.

Security preparations are underway for President-elect Trump’s inauguration ceremony. NBC’s Kelly O’Donnell shares an exclusive look at what the Secret Service and other federal law enforcement agencies are doing to get ready.