Donald Trump would 'cut off cash to Mexico' to pay for 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.

The vote could reshape the Republican race, with front-runner Mr Trump, who has never held elected office, facing a strong challenge from Texas Senator Ted Cruz.