Ben Carson. Photo: Gage Skidmore via Wikimedia Commons.

CNN – Donald Trump on Friday knocked Ben Carson as weak on trade and immigration as he reacted to two new polls showing Carson overtaking the real estate mogul for first place in Iowa.

Trump told CNN’s Jake Tapper that he was “really surprised” to see his fortunes dipping in Iowa and said he is going to need “to work a little bit harder in Iowa” to win back support in the first-in-the-nation caucus state. Two polls released Thursday and Friday showed Trump slipping to second place in Iowa with 20% and 19% of support, respectively, while Carson surged to first place with 28% in both polls.

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