Historian and author Douglas Brinkley said Monday on MSNBC’s “Chris Jansing Reports” that former President Donald Trump “has been dabbling in Adolf Hitler his whole life.” Saturday, at a rally, Trump said, “They’re poisoning the blood of our country. That is what they’ve done. They’ve poisoned mental institutions and prisons all over the world. Not just in South America or three or four countries, but they’re coming into our country from Africa and Asia, and they’re pouring into our country.”