For proof that a wall works, look at Israel 

your say January 03, 2019 01:00

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Re: “No barrier can stop desperately poor immigrants” Have Your Say, yesterday.

Eric Bahrt can’t get it into his head that the present wall on the border between the United States and Mexico does not do the job. Hence the need for Donald Trump’s wall! Mr Bahrt should explain to us why his “friends”, Hamas and Hezbollah, have enrolled to become mining engineers. The simple fact is that a properly designed and constructed wall is not easily clambered over. It is as simple as that, Eric.

Alf Haupt