Four Democratic senators are calling on Treasury Secretary Janet Yellen to take action against trusts and financial vehicles used by the wealthiest individuals to avoid taxes. This comes as Congress is making no progress on how to avert a debt ceiling crisis and the recent collapses of some banks are deepening the stalemate. The senators’ letter is a step towards ensuring that the wealthiest individuals pay their fair share, but it remains to be seen whether the Treasury Secretary will take action on the proposed regulations.