The BBC discovers that a President Donald Trump has a lot of power to make the Mexican government pay for the border wall.
Republican White House hopeful Donald Trump has said he would stop cash sent home by Mexicans based in the US, until the country pays for a border wall.
The prospect of losing a vital source of income would force Mexico into a “one-time payment” of $5-10bn (£3.5-7bn), says Mr Trump.
But US President Barack Obama said the plan was “half-baked” and unworkable.
Mr Trump made his remarks as voters in Wisconsin go the polls to pick their presidential candidates in each party.
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