Donald Trump owes whatever chances he has of being re-elected to the Fed. Without Powell’s quick and decisive action, the economy would be in far worse straits than it is today. Don’t expect Trump to give him any credit, however. As far as he’s concerned, Powell is just another one of his mistaken appointments.
In a similar vein, the Chief Justice has done him a great favor by supporting the Dreamers in the DACA case. By doing so, he gave Trump another rallying cry to fire up his base in November, while taking deportations off the table prior to the election. Had the Court found against DACA, Trump would have felt compelled to hold the Dreamers hostage in exchange for the wall and misguided limitations on immigration; the Democrats would have resisted and played the issue for all it was worth to the electorate.
Don’t expect him to show any gratitude for this stroke of luck, either.