[kinsman redeemer]

Also, liars say, “Believe me.” A lot.

[America_Right]

New Yorkers say “believe me” a lot. It may be a Northeast thing.

[LucienCA13]

Also, liars say, “Believe me.” A lot.
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That is true, but in context here, it’s a salesman’s line. An arcane one, which shows Trump’s game is dated. A type of implantation trick. The better and modern version is “you know it’s true” but you need serious game to play it