On Tuesday morning's 'Fox & Friends,' former House Speaker Newt Gingrich said that following the revelations of what President Obama knew about alleged Russian interference in the 2016 election, the former president will have to testify under oath about what he knew, and when he knew it. <blockquote>NEWT GINGRICH: In addition to writing <a href="">Understanding Trump</a>, I also write novels about terrorism. I wouldn't have the nerve to write this story as a novel, because guess is what is about to happen. The Congress is going to have to call Barack Obama in to testify under oath about when he knew about Russian meddling. Was it really last August? Who told him? Why did he do nothing? Who was in the meetings? Yes, there is a big Russia story, and it is Barack Obama, not Donald Trump... I think the Congress has an obligation to call him in. How can you be so irresponsible? The House and Senate are going to have to call Obama in... Absolutely he's got to come in an testify. </blockquote>