"National security" becomes Trump's executive sledgehammer

What do a White House ban on journalists, a 250-foot arch near the nation's capital and Greenland have in common?President Trump needs all of them for national security purposes, he and his administration have argued.Why it matters: As he's unilaterally shattered presidential norms, Trump has justified his sweeping policy priorities with a familiar two-word rationale: national security.Driving the news: On the morning that the three banned outlets (CNN, MS NOW and Politico) sued the administration, Trump claimed that "FAKE NEWS" is "a threat to our National Security."It's not the first time th