Wall could cost up to $38 billion
There is no guarantee that Mexico will pay.
Republicans in Congress are beginning to grapple with how to help President-elect Donald Trump fulfill one of his biggest campaign promises: to build a wall along the Mexican border to slow illegal immigration.
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Trump is expected to ask Congress to provide the initial funding for the massive project, estimated to cost between $12 billion and $38 billion.
Once construction gets underway, Trump has said he will demand reimbursement from the Mexican government, even though Mexican officials have said they will refuse to cooperate.
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