MXN / USD and the 5% taxes

Trump has announced a not-so-rational think of setting a tax of 5% and growing for Mexican imports. What could that cause in the pair usd/mxn?

I think that the effect in the exports will be low, but the price on the american side will be impacted, so I think maybe a small increase on the pair will be seen.

I see on the chart that the dollar has fallen with a gap. I would never have thought that such news would bring down the dollar.
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2018-08-26_192450