WASHINGTON AP – Numerous missteps marred an insider-trading probe by the Securities and Exchange Commission, which delayed questioning a prominent Wall Street executive until it was too late to bring charges, a Senate review has concluded.

The report by the Republican staff of the Senate Judiciary and Finance committees examines in detail the SEC’s handling of the investigation touching on Wall Street executive John Mack and a major hedge fund, and the firing of a former SEC attorney who has alleged political interference in the probe by agency officials.