Many Newsday readers are holding forth about the Trump travel ban [“For and against Trump travel ban,” Letters, Jan. 31]. Some are encouraged that this “new” extreme vetting will keep terrorists out of our country. I’d like to make a few points.

The vetting of refugees entering the United States legally is an arduous process that has long been in place — yes, under President Barack Obama. It requires applicants to be interviewed by the United Nations, Department of Homeland Security and other agencies. The process takes roughly two years.

The vetting proabably will not catch any terrorists, because someone who is planning terrorist violence won’t submit to the process.

The refugees who were targeted by President Donald Trump’s executive order had documentation; they had already been vetted. A little forethought goes a long way, but that doesn’t seem to be in the Trump playbook. Sad.

Peter Larkin, Bayside

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President Donald Trump is mistaken about putting up a wall between Mexico and the United States [“Tariffs on Mexico to pay for wall could ignite a trade war,” Letters, Feb. 5]. It’s a waste of billions of dollars.

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Mexican migration is subsiding because of Mexico’s expanding economy. Mexico has trade agreements with more than 40 nations, and this has led to growing prosperity.

Trump rejected the Trans-Pacific Partnership treaty, and the United States will lose thousands of jobs to China and other Pacific nations.

Trump should invest the money in a seawall. His policies on global warming will bring havoc to the United States.

William Lemmey, Astoria