Christie said Trump's business tactics aren't translating well in government.
"The president comes from a world where each deal is discrete. We argue, we sue each other and fight and then it's only money and we move on. In this world everyone remembers every slight. ... If you have issues coming up like the Mueller report, like potential investigations from House Democrats, if you have those things, you have to keep your Republicans completely in line with you to be able to fight off a political or legal attack from the other side.