U.S. Treasury yields were mixed on Monday as investors reacted to the announcement of the criminal investigation into Federal Reserve Chair Jerome Powell.

U.S. Treasury yields were mixed on Monday as investors reacted to the announcement of the criminal investigation into Federal Reserve Chair Jerome Powell.

Former Fed Chair and Treasury Secretary Janet Yellen said she was "surprised the market isn't more concerned."

Justice Department probes Fed Chair Jerome Powell as tensions with President Trump over interest rates continue.