NEW YORK (TheStreet) --The Mexican peso is down on Monday morning, following revelations from Friday that the FBI is once again looking into emails related to Democrat candidate for the U.S. presidency Hillary Clinton. The peso has been viewed as a gauge of how markets are perceiving the presidential election, CNBC.com reported.

The currency market is one to be watching ahead of next Tuesday's vote. "We have not seen moves across assets like what we have seen as far as tracking the polls, and the sentiment, and the momentum on this campaign trail," CNBC's Sara Eisen said on "Squawk on the Street" this morning.

The peso isn't down as much today as it was Friday when it saw a decline of 1% after the Clinton email news broke. The peso gained after the first presidential debate, which Clinton was said to have won. Republican candidate Donald Trump has proposed building a wall along the U.S.-Mexico border and forcing Canada and Mexico to renegotiate the North American Free Trade agreement.

The peso was at a record low in September after it appeared that Donald Trump was gaining in the polls, but the currency did rise after all three debates, Eisen added.

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"Of course the feeling here is that a Trump presidency would be hurtful for the Mexican economy. Trump has threatened to rip up NAFTA, renegotiate it, Mexico has been a major beneficiary, so we watch this carefully as we try to figure out what the market is pricing in," Eisen said.

The dollar is gaining on Monday morning.