Walls work pretty good...not getting paid kind of sucks. Mexico was just handed an amount of U.S. cash nearly equal to the amount being fought over for “The Wall” so they can do (stuff) and no one even blinked an eye, we will see no return on that investment (IMHO). The river in TX does nothing to stop people crossing the international border and does not channelize the traffic to areas where it can be effectively worked with boots on the ground assisted by various technologies and air assets.
BTW: The USBP is currently (well maybe not during the shutdown) hiring (were approximately 7,000 Agents short of where we are supposed to be and approximately 2,000 below Congressionaly mandated staffing levels).