US President Donald Trump repeatedly lashed out at the press and at Democrats, while continuing to defend his administration's planned border wall and threatening to declare a national emergency outside the White House on Thursday, en route to the US-Mexico border.

In a quick press conference before boarding Marine One, the presidential helicopter, the president repeatedly called the press fake and dishonest, and stated Democrats don't care about crime.

"They don't care about gang members coming in and stabbing people and cutting people up," he said. "I'll tell you what, they have gone crazy."

While talking about the US economy and his planned trip to the World Economic Forum in Davos, he said, "I find China in many ways to be far more honourable than crying Chuck and Nancy."

Following the press conference, Trump left to McAllen, Texas for a scheduled visit of the border, while the government shutdown marches on, entering its 20th day.

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