A new diplomatic stand off has erupted between the United States and Mexico as President Donald Trump triggered a new debate on who will build a wall along the border of the two countries. It started with the Trump administration seeking to impose a 20 per cent tax on imports from countries with a trade deficit with the US like Mexico to fund the construction of the wall. The issue even led to cancellation of Mexican President's visit to the US and the White House later clarified that the plan was simply "one idea."