 We are about two and a half hours away from the first presidential debate this election cycle between President Biden and former President Trump. Key issues the candidates are expected to address include immigration and the U.S.-Mexico border. CBS News polling released earlier this month found that more than half of likely voters considered border policy a major factor in their vote for president. CBS News immigration and politics reporter Camilo Montoya-Galvez joins us now from Tucson, Arizona.