Special counsel Jack Smith subpoenaed election officials for communications with Trump.
These are the first known subpoenas issued by Smith.
AG Merrick Garland recently appointed Smith to oversee criminal investigations involving Trump.
The subpoenas were sent in recent days to Dane County, Wisconsin; Maricopa County, Arizona; Wayne County, Michigan; and Milwaukee, Wisconsin, per the Post.
All three states were at the heart of Trump's effort to overturn the results of the 2020 election.