Rob, the issue you bring up is narrow considering all the issues facing the nation as a whole. Mexico is foreign policy, security and economics as well.
But take a look at Clinton. She was leading the charge on Iraq in 2002. Gaddafi is dead almost directly because of Clinton foreign policy. She was deeply involved in regime change in Libya and created the mess we call ISIS in Syria. She has a consistent record......she makes things worse than any problem she tries to resolve. Does she get good marks for the Iranian Agreement? She is an ends justify the means foreign policy expert. She is an expert in using the United Nations as cover for military intervention without congressional approval. How about the annex in Benghazi and that fiasco. Her lies to the families of those killed?
I have to to laugh at the hypocracy of a candidate who rails against gun ownership in her own country when she is the architect of arms and ammunition smuggling which destabilized middle eastern countries not to mention fueled the murder of countless innocent citizens.
A famous joke goes like this, "If you hate this country so much, why don't you go live in another country?" And the answer to that is, "Because I don't want to be a victim of its foreign policy." Clinton has a real record of oppressing citizens from other countries.
Trump does not have a diplomatic bone in his body but please don't over look the abusive real historical record of Hillary Clinton and her global interventionism and love affair with the military.