I found this to be useful about how Westchester County (NY) got out of ICLEI (Thanks again to Talk on the Sound)!
Apparently the fairly new County Executive, Rob Astorino, was at a county GOP meeting recently and was asked about the ICLEI withdrawal. The County Executive was on Sean Hannity’s TV show last September and was flooded with emails afterwards on UN central planning:
An interesting question by John D’Alois was posed. He asked how the County came to withdraw from ICLEI. Astorino answered that after his appearance on the Sean Hannity show he was flooded with emails about the central planning and zoning by the UN. The money funding for ICLEI was stopped.