A group of Democratic lawmakers are urging Federal Reserve Chairman Kevin Warsh to disclose any conversations he has had with President Donald Trump since taking over the central bank in May. The request, sent via letter, comes amid news that Trump has periodically spoken by phone with Warsh since he took the role, according to people familiar with the matter.

Trump has continued to urge the Fed to lower interest rates and the White House this month renewed an attempt to dismiss Fed Governor Lisa Cook. The lawmakers' letter seeks transparency about potential political influence on monetary policy decisions.

The Federal Reserve operates independently from political branches, and undisclosed communications between the chair and the president could undermine public confidence in the central bank's autonomy. Warsh has not publicly commented on the reported calls.