HSBC is facing as much as $1 billion in fines for violating anti-terrorism laws and facilitating money laundering at its Mexican unit and providing access to the U.S. financial system to drug cartels.

The bank is investigated by at least three U.S. regulators for a decade of compliance practices at its U.S. unit and the head of the compliance David Bagley told a U.S. Senate hearing he will step down.

The bank is also investigated by the Department of Justice and Internal Revenue Service for its possible role in helping Americans evade taxes through HSBC India.