If you believe the US media, there is not much effectiveness in the Mexican systems' fighting drug lords, and curtailing illegal emigration to the US. Security and human rights are but myths.

The Mexicans have to find something more menacing to threaten the US with, than insipid promises of clawing back on these services. 

They need something big, like a Trump-like election promise, of sorts, to impress the big guy. They should promise to rename Guajira province to Ivanka, and Mexico City to Trump City. I am joking, but I am not.