President Trump stated that "People are pouring into our country, including terrorists. We have terrorists. We caught 10 terrorists over the last very short period of time. Ten. These are very serious people. Our border agents, all of our law enforcement has been incredible what they’ve done. But we caught 10 terrorists. These are people that were looking to do harm." (
Source.)
He presumably divined that number from a June report by DHS Secretary Kjirsten Nielsen that reads in part, "The result is that we are identifying and stopping terror suspects who would otherwise have gone undetected. In fact, on average, my Department now blocks 10 known or suspected terrorists a day from traveling to or attempting to enter the United States." (
Source.) However, that counts every method of entry, not just the Mexican border; also, it states that they "block" ten people per day, not that they catch them.
However, President Trump's State Department reported in 2017 that "There are no known international terrorist organizations operating in Mexico, no evidence that any terrorist group has targeted U.S. citizens in Mexican territory, and no credible information that any member of a terrorist group has traveled through Mexico to gain access to the United States." (
Source, p. 290)
We already know the President doesn't like to read reports, and he has a history of hearing statistics and statements half-way and then making the rest up, especially when he is as emotional and frustrated as he was during this meeting. He pretty clearly made that up.
Incidentally. VP Pence made a similar claim in February: "[A]long the southern border of the United States, we actually still apprehend 1,100 individuals a day, who are attempting to enter this country illegally, including seven individuals a day who are either known or suspected terrorists." (
Source.) However, the 2017 DOJ/DHS report on which he based this claim stated that "
n 2017 alone DHS had 2,554 encounters with individuals on the terrorist watch list (also known as the FBI’s Terrorist Screening Database) traveling to the United States." (Source.) That works out to about seven per day total, but the report specifies that only 335 of these were "by land," which would also include through Canada.