The United States has to be a leader in the world, because the problem is: If we are not leading, nobody else will.

My impression is that Putin feels that he can basically manipulate the West to do what he ultimately wants to achieve, and that he feels he's gotten away with it so far, and that all he has to do is basically play the same game.

We have throughout our history been tested when it comes to the institutions of our democracy. And thank God our forefathers were smart enough to establish a government of checks and balances to make sure that power cannot be centralized in any one branch of government. And those institutions have proven themselves.

The potential for the next Pearl Harbor could very well be a cyber-attack.

Companies should be able to share specific threat information with the government without the prospect of lawsuits hanging over their head.

One of the principal qualities that you need as national security adviser is trust, the trust of the president. And that depends on truth and it depends on honesty.

People elected Donald Trump because he acts decisively. He fired James Comey. He didn't fire the entire FBI. If there's something there, the FBI is going to continue to investigate it.