KEY POINTS
  • Sen. Elizabeth Warren, along with Rep. Jesus Garcia, sent a letter to Federal Reserve and the FDIC, questioning their approval of the $28 billion merger of BB&T Corp. and SunTrust.
  • Warren, a leading candidate in the Democratic presidential field, believes the process to review bank mergers is "fundamentally broken."
  • She recently unveiled the Bank Merger Review Modernization Act, which is unlikely to pass the Senate but puts a spotlight on the process of approving bank deals.
Democratic presidential candidate Senator Elizabeth Warren speaks as she visits a picket line of striking teachers in Chicago, October 22, 2019.

Presidential hopeful Sen. Elizabeth Warren sent a letter to Federal Reserve and the Federal Deposit Insurance Corporation, questioning regulators' approval of the largest bank deal since the financial crisis.

The letter, dated Dec. 12 and obtained by CNBC, asks regulators to defend their approval of the $28 billion merger of regional banks BB&T and SunTrust. The deal, which closed Dec. 6. has been a lightning rod for Democrats who believe its approval symbolizes a weakening in U.S. regulation of financial institutions under President Donald Trump.