migrant detention centers. what will it take to improve conditions for children in u.s. custody? plus, down south, 2020 democrats make nice in south carolina. >> it's good to be in the palmetto state. >> as the hopefuls try to win the support of black voters. will the current front-runner keep his place on top? 2020 presidential candidate julian castro joins in moments. hello, i'm jake tapper in washington where the state of our union is to the brink and back, you might be feeling whiplashed this week after president trump reversed course on two major decisions, one domestic, one international. the president announced he was delaying mass deportation after threaten all week that millions of undocumented immigrants would be removed. just minutes ago he followed up. quote, i want to give the democrats every last chance to quickly negotiate simple changes