| Some fencing already exists on the 2,000-mile (3,200km) US boundary with Mexico |
Mexico has condemned a US suggestion
that it may impose a 20% tax on Mexican imports to pay for President
Donald Trump's planned border wall.
| Trump and Pena Nieto met in Mexico before the US presidential elections |
Earlier this week, the president signed an executive order to create a wall along the 2,000-mile (3,200km) US-Mexico border.
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He also stressed that paying for Mr Trump's wall "is not negotiable" for Mexico. Earlier on Thursday, White House spokesman Sean Spicer said a 20% tax could generate approximately $10bn (£8bn) in tax revenue per year.
"Right now our country's policy is to tax exports and let imports flow freely in, which is ridiculous", he said, adding that the tax will "easily pay for the wall".
But Reince Priebus, the White House chief of staff, later said that the border tax is only one of several options being considered.