President Donald Trump warns automakers not to hike vehicle prices following new tariffs on imported cars and parts.Trump insists that automakers keep sticker prices steady, suggesting that tariffs would lower vehicle prices in the long run.Automakers express concerns about the financial squeeze caused by tariffs, as they rely heavily on foreign-made components.A Morgan Stanley analysis predicts the average price of a new vehicle to rise 11% to 12% by early summer due to tariffs.