Nielsen briefed the negotiators on the situation on the U.S.-Mexico border, according to the readout, adding that the Democratic side "requested further details in writing on the needs" of her department.

Trump dug in on his proposal again Saturday morning, tweeting that "we are working hard at the Border, but we need a WALL!"

The president said Friday after meeting with congressional Democratic leaders that he was prepared for a partial government shutdown to last for months or even years if they don't agree to provide funding for border security, including the wall.

He also signaled a possibility of using emergency powers to build the wall without congressional approval and necessary funds.

House Democrats passed a spending package earlier this week, including a stopgap bill to keep the Homeland Security Department funded at the current level until Feb. 8, and measures to fund the eight other cabinet departments affected by the shutdown through Sept. 30, the end of the fiscal year.

However, those measures are unlikely to be taken up by the Republican-held Senate or be signed by Trump as they do not provide money for Trump's border wall.

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