The president-elect's undiplomatic talk in recent days of reclaiming the Panama Canal — and annexing Greenland and even Canada — have some experts comparing his strategy to Nixon's "Madman Theory."

President-elect Trump has inspired Republican members of Congress to introduce a bill that would allow the federal government to take steps to repurchase the Panama Canal. Why it matters: It's the second time this week GOP lawmakers have rushed to propose legislation that would codify Trump's vision for a new era of American expansionism.