What do today's Republicans believe America's role in the world should be? The GOP's presumptive nominee for president, Donald Trump, has some very different ideas than the Republican foreign policy establishment about the global alliance system, free trade, and the current nuclear order. Senator Tom Cotton, a leading figure in Republican defense and foreign policy circles, will discuss the Republican worldview, Trump's worldview, the Obama foreign policy doctrine, and what he thinks America's role should be in these tumultuous times.