WASHINGTON, April 21--Key experts and stakeholders came together Wednesday to call on the U.S. Senate to reject full repeal or "backdoor repeal" of the estate tax next month. Numerous organizations including unions, anti-poverty, public interest, and faith groups are hoping to prevent estate tax repeal, which will cost $1 trillion over the next decade. Participants added a diverse range of perspectives to the argument that repeal of the tax is impractical, unnecessary, and too costly.