ABC news did an article checking trump's claims about the drops in illegal
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trump: "
.(snip)... illegal traffic dropped 92 percent once the wall was up. El Paso, illegal traffic dropped 72 percent then ultimately 95 percent once the wall was up. In Tucson, Arizona, illegal traffic dropped 92 percent. Yuma, it dropped illegal traffic 95 to 96 percent...(snip)."
According to DHS, the “wall” in San Diego was built in 1992, and, the agency spokesperson told ABC News, “Illegal traffic has dropped 92 percent over the past 23 years.”
DHS tells ABC News, El Paso border security was built in 1993 and afterward illegal traffic “dropped 72 percent in one year and 95 percent over 22 years.”
DHS officials said that the Tucson structure was built in 2000 and Yuma construction started in 2005. DHS officials said that illegal traffic has dropped in Tucson by 90 percent in the past 15 years, and by 95 percent in nine years.
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As gross a misrepresentation of the truth as this is - appearing to claim credit for something he had nothing to do with and omitting the time frame for the percentages quoted - this strikes me more as a prepared, deliberate, structured lie, with a planned back-up 'what i said was (technically) true', atypical of trump's usual outright falsehood. The kind of thing you'd expect from an oily Stephen Miller-type.