>> Defence Secretary Jim Mattis at the U.S. Mexico border in Texas on Wednesday, showing his strongest support to date for President Trump's decision to send thousands of troops there in an effort to stop a group of Central American migrants heading north. Mattis calling the mission absolutely legal and justified.
>> Border security is part of national security. Our units are in a position to enable the border patrol's law enforcement operations.>> The visit comes as the migrants, many of them fleeing poverty and violence, remain several hundred miles away. Trump hasn't said much about the so-called caravan since the midterm elections last week.
>> That's an invasion, that's not, that's an invasion.>> He had talked non stop about it in the run up to the Election, using language his critics decried as an attempt to stoke fear and drive Republicans to vote. Along for the trip to the border was embattled Homeland Security Secretary Kirstjen Nielsen, who is reportedly on her way out of the Trump Administration.
Mattis, who's faced similar rumors, told troops to ignore the media and to back up her agency.>> Is there anything you need that you don't have?>> Despite Mattis's stamp of approval at the border, Democrats are still threatening to investigate the deployment once they take control of the house early next year.
With some of Trump's biggest critics calling it a gross abuse of power.>> We're not letting these people invade our country.