Gen. Jack Keane, a retired 4-star general, the chairman of the Institute for the Study of War and Fox News Senior Strategic Analyst

Topic: NATO 75th Anniversary Summit

Liz Peek, Fox News contributor and former partner of major bracket Wall Street firm Wertheim & Company

Topic: "Democrats claim 81-year-old Biden is a great president. But his biggest fails have nothing to do with age" (Fox News op ed)

Ed Kovalik, CEO and Founder of Prairie Operating Group, a debt-free producer of American Energy

Topic: OilFacts.com, unleashing our energy potential