NBC’s Vaughn Hillyard reports that Sen. Ted Cruz has retuned his Iowa campaign message choosing to not attack Donald Trump. That’s a reversal from the previous two weeks, during which Cruz went after Trump’s record hitting 17 different positions held – or formerly held – by Trump.

The Cruz campaign also launched two ads against the Trump last week. The first ad, began airing an ad last weekend targeted Trump as a “fat cat” who supports and uses eminent domain. The Second ad goes after Trump for his New York values. It highlights several sound bites from a Meet the Press interview with Trump in 1999. During that interview then-moderator Tim Russert pressed the Donald on his views about abortion and gay marriage. Trump told Russert his stances on the controversial social views were shaped by his residency in New York.

According to Hillyard there are growing questions about how successful those attacks have been and whether they’ve hurt Cruz more than Trump. So Cruz is now campaigning with stump speeches that mimic those he delivered through the fall and early part of winter. Those speeches deliver a message of “hope and optimism” focusing almost solely on Cruz’ own principled Conservative record and policy proposals.

After Trump’s rebound in the Iowa polls and what was seen by some as a less than stellar debate performance than usual in Thursday’s Trumpless debate, the Cruz retuning is a smart move.