One day after launching an investigation that could delay Loretta Lynch’s confirmation to be attorney general, a Republican senator is raising more questions about her role in a money laundering settlement involving a global bank, terrorists and drug cartels.

Lynch, the U.S. attorney for the Eastern District of New York, negotiated a settlement in December 2012 with HSBC bank employees who were accused of funneling millions of dollars to terrorist organizations and Mexican drug cartels.

Her decision to let them walk away without criminal prosecution sparked inquiry from Sen. David VItter, R-La., and a host of questions Friday.

Lynch, nominated by President Obama to replace Eric Holder as attorney general, is already facing a rocky reception in the Senate, which won’t vote on her confirmation until March at the earliest.

Now, she’s being asked why she did not “immediately prosecute” bankers for allegedly shielding wealthy clients from having to pay their taxes.

“Lynch, who was in charge of the settlement, completely ignored the serious tax evasion allegations against HSBC,” said Vitter.

Vitter, a member of the Judiciary Committee, is leading the probe into Lynch’s involvement in the HSBC settlement and plans to delay her confirmation until she answers a series of questions.

“If Ms. Lynch wants to be the very top lawyer in the United States, she must explain how a simple monetary fine is severe enough punishment for a massive money laundering scheme involving Mexican drug cartels and terrorist organizations,” he said.

According to Vitter, the Justice Department had knowledge of HSBC’s shielding clients from their tax liabilities as early as April 2010.

To date, no criminal charges have been brought against HSBC for its alleged tax evasion scheme, which occurred during Lynch’s tenure as a federal prosecutor for the Eastern District of New York.

Lynch negotiated a $1.92 billion settlement with HSBC in December 2012 for laundering more than $200 million through its U.S. bank. The employees allegedly opened fake accounts using customers’ private information.

>>> Read More: Senator to Loretta Lynch: Why Did No One Go to Jail for Laundering Money to Terrorists?

Below is a copy of Vitter’s follow-up questions for the record to Lynch: