President Trump's new policy of separating migrant children from their parents at the U.S.-Mexico border is still dominating the news, and "there are two ways to look at this story: Either you can be horrified, or you can work for Donald Trump," Stephen Colbert said on Tuesday's Late Show. He started with Press Secretary Sarah Huckabee Sanders, who opted out of Monday's press briefing, handing the show to Homeland Security Secretary Kirstjen Nielsen because she didn't want to field questions about splitting apart families.