Basically, Puzder couldn’t get past the immigration litmus test with Republicans:
“Steve Bannon and Stephen Miller, two of the most powerful voices in President Donald Trump’s inner circle, were never strongly behind Andy Puzder as labor secretary, believing he was too soft on immigration.
So when Puzder’s nomination was teetering on the brink of implosion in recent weeks, that lack of support from the president’s top aides left Puzder, whose backing was already eroding in the Senate, with little choice but to withdraw his name, according to two sources close to Puzder. …”
This is good news. It shows how much the goal posts have shifted.