The estate tax and charities are closely linked, according to Bloomberg in "GOP Plan to Kill Estate Tax Sets Up Charitable Giving Conflict."
The issue is that one of the most common ways to get around the estate tax is to shrink an estate to just below the estate tax exemption limit, and a great way to do this is to give money to charity.
When the estate tax was temporarily eliminated in 2010, charitable giving was reduced by 37%. This has many charities very nervous about the possibility that the estate tax could be eliminated again.
With or without the estate tax, an experienced estate planning attorney can advise you on an estate plan that fits your unique circumstances.
Reference: Bloomberg (Aug. 25, 2017) "GOP Plan to Kill Estate Tax Sets Up Charitable Giving Conflict."