Trump has not walked back anything.
Please. He "hasn't walked anything back?"
Did you miss the "pivot" re: taxes? In Trump’s tax plan, the wealthiest individuals would get a tax break, with the top tax rate dropping from 39.6 percent to 25 percent. But when pressed on taxes for the wealthy, he predicted that the top rate would be higher than the plan says.
Throughout the last months of 2015, Trump thundered repeatedly about banning Muslims from the US. Now... it's just a "suggestion."
During the 31 March interview with Chris Matthews, Trump stated he believed women who have abortions should be "punished." Yet mere hours later, he retreated.
Even a political neophyte with modest intelligence like Trump should understand ceasing with idiotic, misguided, attention-seeking comments would lessen the need for "walking them back" later.