Elizabeth Warren asks Jamie Dimon if he was advised to ‘mildly threaten’ UK chancellor over tax on bankers’ bonusesA leading Democratic senator has written to the boss of JP Morgan to request clarification on the bank’s contact with the child sex offender Jeffrey Epstein.Elizabeth Warren, the top Democrat on the senate banking committee, wrote to Jamie Dimon last week to ask if he took advice from Epstein while lobbying against a UK tax on banker bonuses, in a letter published by the committee o