Telling supporters that there is no family other than the Trumps that will work harder for them, he said they will preserve "the moral fabric of the country".
He continued: "Because when you watch the nonsense on TV, when you see these animals literally taking over our cities, burning down churches, this isn't America."
"They represent the smallest fraction of our society", he added, saying that Americans do not support that kind of behaviour.
Standing with his wife, Lara, Mr Trump Jr went on to say that they will also protect religious liberty.
"We are going to say 'Merry Christmas', which is totally under assault," he said
He also promised to protect the second amendment.
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