After months of criticizing Federal Reserve Chair Jerome Powell, President Donald Trump took the fight to the Fed’s front door on Thursday, publicly scorning the central bank chief over the ballooning costs of a long-planned building project.

The president toured the Federal Reserve’s headquarters with its chair, as the administration intensifies its campaign against his handling of the economy and the multibillion-dollar project.

President Donald Trump locked horns with Federal Reserve Chair Jerome Powell during a rare presidential visit to the U.S. central bank on Thursday, criticizing the cost of renovating two historical buildings at its headquarters and pressing the case for lower interest rates.