The Supreme Court declined by a 5-4 vote Friday to halt the Trump administration's construction of portions of the border wall with Mexico.

The wall is part of Trump's initiative to stop migrants from crossing into the U.S.

"Mexico understands that we're going to close the border or I'm going to tariff the cars. I'll do one or the other, and probably settle for the tariffs," Trump said at the White House.

Declaring a national emergency at the southern border would prompt a legal fight that would test the powers of all three branches of government.

U.S. President Donald Trump has indicated he’s prepared to sign the government funding bill.

Negotiations collapsed over the weekend over Democratic demands to limit the number of migrants authorities can detain

In a new hurdle in the attempt to reach a compromise on border security, bargainers clashed over whether to limit the number of migrants authorities can detain.

Chuck Schumer has been praised, but also criticized, for not forcing Democrat senators to vote the same way, as past leaders have done.

So far, about 339,000 people have contributed a total of over $20 million.

“When, during the campaign, I would say Mexico is going to pay for it, obviously I never said this and I never meant they’re going to write out a cheque,” Trump said.