Top economist David Rosenberg says inflation will come down hard no matter what the Fed does - so more hikes would be a mistake

• David Rosenberg believes US inflation will come down hard regardless of the Federal Reserve's next move. 
• That means it would be a mistake for the Fed to keep hiking interest rates, the veteran economist said.
• Once cooling rental prices shows up in official data, inflation will drop more than expected, he said.

Inflation is going to shoot lower in the US no matter what the Federal Reserve decides to do next on monetary policy, according to top economist David Rosenberg. 

That means the US central bank would be wrong to make any more interest rate hikes, the Rosenberg Research founder said in a CNBC interview Tuesday.