President Trump is in McAllen, Texas, visiting the southern border where he also attended a roundtable meeting on border security. 

He is seeking to use the trip to bolster his argument that a wall is needed on security and humanitarian grounds.

The president and congressional Democrats remain at an impasse over his demand for $5.7 billion for a wall along the southern border. Critics say Trump overstates the security risks and that the administration is at least partly to blame for the humanitarian situation.

Earlier, President Trump said it would be "very surprising" for him not to declare a national emergency if he can't make a deal with Democrats to pay for his promised U.S.-Mexico border wall.

He said Thursday, "We have to get a win ... or I will declare a national emergency."

He has talked about declaring a national emergency before.

Trump also defends his repeated claims that Mexico will pay for his wall - even when Mexico has said it won't.

Trump says he "never said they were going to write out a check" and would pay for it indirectly "many, many times over."

Democrats have called the wall "immoral."

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