The debate over witnesses in Trump's impeachment trial

The US Senate heard arguments Friday over whether to consider hearing from witnesses in the impeachment trial of President Donald Trump. And, it's Brexit time. At midnight Friday (Brussels time), Britain officially ends its membership in the European Union. Plus, immigrants and refugees in Iowa discuss how they see both opportunities — and obstacles — to their participation in Iowa caucus and in American political life.

The US Senate heard arguments Friday over whether to consider hearing from witnesses in the impeachment trial of President Donald Trump. And, it's Brexit time. At midnight Friday (Brussels time), Britain officially ends its membership in the European Union. Plus, immigrants and refugees in Iowa discuss how they see both opportunities — and obstacles — to their participation in Iowa caucus and in American political life.