Bankruptcy Judge James Peck yesterday gave creditors of Lehman Brothers approval to subpoena former JPMorgan Chase & Co trader Bruno Iksil, the so-called "London Whale," in an $8.6 billion lawsuit against the bank, Reuters reported yesterday. Judge Peck rejected arguments from JPMorgan that Iksil had little to do with the allegations in the lawsuit, which centers on JPMorgan's role as Lehman's main clearing bank in the days leading up to its Sept. 15, 2008, bankruptcy. Lehman and its unsecured creditors' committee accuse JPMorgan of using its access to Lehman to extract $8.6 billion of collateral in the four business days ahead of the chapter 11 filing.