President Donald Trump is pressing the Federal Reserve to cut borrowing costs, and one of his main arguments is that it will help bring down mortgage rates for would-be homebuyers.

After a tour that saw Trump and Powell publicly trade barbs over the cost of the project, Trump maintained there was “no tension” with the Fed chief and indicated that problems with the project probably weren’t reason enough to fire the central bank head. “To do that is a big move, and I just don’t think it’s necessary,” Trump told reporters.

The president wants to get rid of the Fed chair—if the markets will let him. We all have to hope he won’t gamble on that.