Building the wall was Trump's signature campaign promise, and the White House appeared determined to get Congress to approve a down payment as part of a bigger bill to keep the US government funded.
Trump weighed in on Twitter, insisting Mexico will pay for the wall "but at a later date so we can get started early."
"The Democrats don't want money from budget going to border wall despite the fact that it will stop drugs and very bad MS 13 gang members," he wrote.
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