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Going to be picky here but actually, guns aren't part of the American constitution, arms are. Similar to the English Bill of Rights from which it was drawn, it considers that any person may be called on to fulfil militia responsibilities and ensures that they can own any form of weapon that may be appropriate to that.
Or course subsequent debate, interpretation and Supreme Court rulings have informed Federal, State and Local legislation in respect to guns but the Constitution isn't included other than a standpoint from which to make that legislation.
Guns are part of the American constitution, as well as being a massive part of their economy.
Trump will still be happy to do business with the Saudis though...