US President Donald Trump reiterated his demand for "a wall or a barrier" as he visited the US-Mexico border in McAllen, Texas, on Thursday.

"They need a barrier, they need a wall. If you don't have it, it's going to be nothing but hard work and grueling problems. And by the way - and death. And death. A lot of death," the US President said in a press briefing.

Trump however stated he would in favour of a "broader form of immigration," saying that "we can help the dreamers; we want to help the dreamers."

Trump's visit to the Texas border comes amid a government shutdown showdown with the Democrats over the funding of the border wall - Trump's signature campaign promise.

As it enters its third week, the government shutdown is set to become the longest in history on Saturday.

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