Why the Mexican peso continues to plunge against the US dollar

The Mexican peso is the second most volatile currency among emerging market economies after the Brazilian real.
Falling oil prices and tensions caused by the upcoming presidential election in the United States have accelerated the depreciation of the Mexican peso over the last few days.
The Mexican peso could close the year at 19.80 to the dollar, say some pundits.
In June, after the UK’s Brexit vote, the Bank of Mexico raised interest rates to halt the decline of the peso.
But, if the Fed acts before December, the Bank of Mexico is expected to do the same though it will not improve the position of the peso.

Fuente: http://elpais.com/elpais/2016/09/16/inenglish/1474035969_997088.html