Warren, Sanders, O'Rourke and Castro set for Milwaukee forum

Democratic presidential candidates Bernie Sanders, Elizabeth Warren, Beto O'Rourke and Julian Castro are participating in a town hall in Milwaukee sponsored by the Hispanic civil rights organization LULAC

Each candidate will be onstage for 20 minutes Thursday evening. Immigration is expected to be a prominent topic.

LULAC spokesman David Cruz says every candidate was invited months ago. Cruz says of those who responded, the field was narrowed down to candidates who resonated most with LULAC members.