* Sen Sanders to propose position limit bill next week
* Bill would force CFTC to curb oil market speculation
* Proposal latest effort to prod CFTC action
By Christopher Doering
WASHINGTON, June 2 (Reuters) - An outspoken U.S. senator who criticized the country's futures regulator for failing to crackdown on energy speculation said on Thursday he will introduce legislation next week that will force the agency to act.
Senator Bernie Sanders said...