When the weather warms up will our government again start importing Central American children by the thousands? Kids that haven't been vaccinated? If so, any discussion about this is moot.
Argument of ignorance. There has been almost no reported cases of measles in Central America (and most of the Western Hemisphere for that matter outside of imported cases):
http://www.who.int/immunization/mon.../big_measlesreportedcases6months_PDF.pdf?ua=1
And the vaccine rates for most of the Western Hemisphere is above 90%
http://data.worldbank.org/indicator/SH.IMM.MEAS/countries
So stop the trying to drum up the stupidity that this is somehow an issue of illegal immigration.