Immigration is the most difficult issue I've ever dealt with, and I've dealt with some tough issues: drones, gays in the military, WikiLeaks, Guantanamo. But immigration is hardest because there are so few people willing to talk and build consensus. Everybody's firmly made up their mind. It's a polarized issue.

Under well-settled legal principles, lethal force against a valid military objective, in an armed conflict, is consistent with the law of war and does not, by definition, constitute an 'assassination.'

In my view, targeted lethal force is at its least controversial when it is on its strongest, most traditional legal foundation. The essential mission of the U.S. military is to capture or kill an enemy. Armies have been doing this for thousands of years. As part of a congressionally authorized armed conflict, the foundation is even stronger.

ISIL, AQ, now have the ability to literally reach into our homeland through social media, through the Internet, to recruit and inspire. It makes for a more complicated homeland security environment. And so it requires a whole of government approach, not just military and law enforcement, homeland security, aviation security, and the like.

The people in Washington are getting rich with our money. Under President Barack Obama, the federal government swelled to record size, and it took more and more of our money to pay for it. Who benefitted? Not Missouri farmers or workers.

By every measure, John Kennedy's sex life was compulsive and reckless. At one level, it had clear public consequences. Knowledge of Kennedy's behavior gave FBI Director J. Edgar Hoover absolute job security, as well as the potential power to derail Kennedy's re-election had he survived assassination.

Teachers, social workers, public lawyers who bring companies to justice, government accountants who try to make sure money is spent as it should be - all need at least four years of college.

Fracking is doable if there's full disclosure of all chemicals used. Secondly, science dictates the policy rather than politics. Third, there's collaboration between environmental groups and the natural gas industry.