Federal Reserve chief Jerome Powell's job at the head of the US central bank is safe, White House economic advisor Larry Kudlow said yesterday.

President Donald Trump has lambasted Powell repeatedly for raising interest rates, which he complains is undercutting his attempts to supercharge the US economy.

Asked at an economic forum if Powell's job was safe, Kudlow said, "Yes, I believe it is. There is no effort to remove him -- I will say that unequivocally -- at the present time."

The White House explored whether Trump could replace the central bank chief, according to media reports.

Trump's frequent attacks break from longstanding tradition of US presidents to refrain from commenting on monetary policy to preserve the central bank's operational independence.