WASHINGTON ― President Donald Trump on Wednesday again attacked the Federal Reserve Board and demanded members drop interest rates “to ZERO, or less” ― a move that would benefit him personally by some $8 million a year.

Trump has approximately $340 million in variable-rate loans from Deutsche Bank financing several of his properties, with the amount of interest he must pay annually tied either directly to the benchmark set by the Fed or to a rate that in turn rises and falls with the Fed rate.

Bloomberg News estimated that each quarter point reduction in the Fed rate saves Trump some $850,000 ― meaning that if the central bank dropped that rate from the current 2.25% down to zero, Trump’s own interest payments would drop $7.65 million annually.

“It is hard to see this as anything other than an attempt to save millions of dollars a year,” said Jordan Libowitz from the watchdog group Citizens for Ethics and Responsibility in Washington. “In a presidency defined by Trump’s personal profits, he does not deserve the benefit of the doubt.”

Trump’s White House did not respond to HuffPost queries on the matter, or on the rationale for taking such drastic measures in a relatively strong economy. The Federal Reserve Board last lowered interest rates to zero during the financial crisis a decade ago. Rates have never been below zero ― meaning the central bank would pay borrowers to take money ― although that tactic is being used in Europe and Japan to stimulate their economies.

Trump has been attacking the Federal Reserve Board for over a year, and in particular its chairman, Jerome Powell, whom he himself appointed to the job. Wednesday’s broadside came in a pair of tweets sent at 6:42 a.m.:

“The Federal Reserve should get our interest rates down to ZERO, or less, and we should then start to refinance our debt. INTEREST COST COULD BE BROUGHT WAY DOWN, while at the same time substantially lengthening the term. We have the great currency, power, and balance sheet…. The USA should always be paying the the [sic] lowest rate. No Inflation! It is only the naïveté of Jay Powell and the Federal Reserve that doesn’t allow us to do what other countries are already doing. A once in a lifetime opportunity that we are missing because of ‘Boneheads.’”