My mother taught me about the power of inspiration and courage, and she did it with a strength and a passion that I wish could be bottled.

I will not speak to Vladimir Putin personally until we've rebuilt the 6th Fleet a little bit right under his nose; rebuilt the missile defense program in Poland right under his nose; and conducted a few military exercises in the Baltic states.

So what will define greatness for your generation? I believe it is to use the knowledge that you have earned here to find ways, not only to connect to computers, but to connect to people; not only to bridge gaps in science, but to bridge gaps between cultures; not only to use numbers and formulas to create, but to use words to lead, and in the process, to close that canyon between ignorance and understanding.

I will reform our broken visa system. Nearly half of the people in this country illegally came here on legal visas and simply never left. We need to fix that.

Donald Trump you're never going to be president of the United States by insulting your way to the presidency.

Look, you need technical skills to run a company.

When you don't respond to bad behavior, you get more of it.