Money is money is money. If you spend money there, you can't spend money there. So they are incredibly related. I do not live there, but that has nothing to do with it. It has everything to do with the fact that they've been living without clean drinking water since April 2014, so I don't think it's "under control." How would you like to use hundreds of water bottles just to take a bath?
Shit is not good there, and now we're spending upwards of $20B on a border fence when
1) illegal immigration is at an all-time low
2) illegal immigrants crime rates are the lowest they've been in history
3) the only thing that has bolstered the US population has been immigration. the birth rate per couple is ~1.8, to sustain the population you need an average of 2.1. By enforcing a border wall, you drive down immigration, lessen the amount of available money to the government (via taxes) and that's available in the system, tariffs go up, commodities and basic good prices go up, inflation takes hold. In a period of stagnating wages, higher inflation is like insanely not good.
those are truths. individuals that hang on to the boogie man of the illegal immigrant holding the american people down have really go to check themselves. They have had impacts, but the rhetoric of Trump does not match up with what's going on in reality.
Oh, if you took a small sample of middle-to-lower income class illegal immigrant families (who still contribute taxes and money into the economy), they probably paid more taxes than Trump over a given period.