JPMorgan Chase CEO Jamie Dimon is slated to testify twice next month before both the House and the Senate, the New York Times' DealBook blog reported yesterday. Dimon agreed to testify before the Senate Banking Committee on June 13. Dimon, who will face questions about his bank’s recent multibillion-dollar trading loss, is also set to appear before a House panel on June 19. The Senate committee initially invited Dimon for June 7, but JPMorgan sought more time.