The Department of Homeland Security was founded after the attacks of Sept. 11 to prevent further foreign terrorist attacks. Now, under the leadership of Kristi L. Noem, it is almost exclusively focused on apprehending undocumented immigrants.

Why smaller houses can make us happier

Post Reports is the daily podcast from The Washington Post. Unparalleled reporting. Expert insight. Clear analysis. Everything you’ve come to expect from the newsroom of The Post, for your ears. Martine Powers and Elahe Izadi are your hosts, asking the questions you didn’t know you wanted answered. Published weekdays around 5 p.m. Eastern time.