Or Coast Guard for that matter. People don't understand that not all Cartel drugs come in across the border.
Again my solution if the new Mexican President allows: Spec-Ops teams and drones in a continual sweep against the Jefes and their wanna-be subordinates. It worked with al-Qeada and with ISIS. Kill the leadership and the organization tends to fall apart. Anyone who finds a new plan to ascend to the throne, kill them ASAP.
All the globe's trouble spots are in areas that have very poor to no border control. Look at a map - there's no way to prevent the flow of arms, people, etc, which is why central government forces cannot control the territory. So, since government really doesn't exist, it takes a foreign power like the US - and UK, France, Russia and Turkey before us to impose order. As such, there's also no blow-back from any offended parties (other than the terrorists) because there's no there, there.
MX, OTOH, is just like a narrower version of the US. In fact, their southern border is extremely easy to police. So, regardless of what people may imagine MX to be like, it really is a functioning, centrally controlled government. Just a crazy, wild west corrupt version, but certainly operating in control.
The **problem** is, however, that the functioning MX government and economy is based on the drug trade. So the issue is economic, not religious, not anti-colonial, not any of the list of traditional 3rd world grievances, but rather simply the question of: what will Mexicans do to earn a living if the drug trade is impacted?
Get it? The challenge for Trump et al is to figure out a way for MX to transition its economy away from easy money drugs to something a little more substantial. And that, to anyone who's ever been down there and comes back with the same question, is: why isn't MX developing it's vast treasure trove of beautiful real estate? And the answer is prohibitive rules & regs, including laws against non MX citizens from owning coastal real estate.
Fix that, and who would waste time plying the drug trade when there would be vast $trillions to be made developing vacation/residential haciendas for the billions of Chinese, Indians, etc that would rush the country?