Full interview: Nevada Sen. Catherine Cortez Masto discusses re-uniting families separated at the US-Mexico border

Although the Trump Administration has announced that it is now seeking to re-unite families who had illegally crossed the United States-Mexican border, many of them still remain separated.

Sen. Catherine Cortez MastoCatherine Marie Cortez MastoDemocrats press Trump Treasury picks on donor disclosure guidelines McConnell challenger faces tougher path after rocky launch The Hill's Morning Report - A raucous debate on race ends with Trump admonishment MORE joined "Rising" correspondent Jamal Simmons to discuss the issue. According to the Nevada Democrat, Kirstjen NielsenKirstjen Michele NielsenTop immigration aide experienced 'jolt of electricity to my soul' when Trump announced campaign Trump casts uncertainty over top intelligence role Juan Williams: Trump, his allies and the betrayal of America MORE, the head of the Department of Homeland Security has claimed that the parents of still-separated families "gave up their right to be reunited," a statement that Cortez Masto called "a total lie" based on interviews she had conducted with several of them.