President Donald Trump on Thursday was face-to-face with Fed Chairman Jerome Powell during a bizarre visit to the the Federal Reserve building in Washington, DC.

It marked a rare public appearance between Trump and a man he's consistently harangued for failing to follow his instructions to lower interest rates.

The unlikely pair bickered lightly - wearing hardhats and before cameras - about the massive $2.5 billion project to renovate the Fed building.

When the president tagged the total project cost at close to $3.1 billion, Powell demurred, noting that Trump's calculation included a building that was finished five years ago.

White House officials maintained afterward the $3.1 billion figure is the cost of the entire project.