Actually it looks like it was both of them...
https://www.freep.com/story/news/politics/elections/2020/11/19/wayne-county-board-of-canvassers-monica-palmer-william-hartmann/3775242001/

Both Republican members of the Wayne County Board of Canvassers signed affidavits late Wednesday saying they want to rescind their votes to certify the county's election results.

It is not clear what effect, if any, the affidavits have. A spokeswoman for the Bureau of Elections said there is no legal mechanism for board members to rescind their votes.

"It means absolutely nothing," said Jonathan Kinloch, a Democratic member of the Wayne County Board of Canvassers, who said the affidavits are a ploy to be used in an existing or future lawsuit.

Kinloch said the board even approved a second motion waiving reconsideration of the certification. "We had a definite deadline of 14 days to certify, and they knew that. This is now out of our purview," he said.

The affidavits signed by Monica Palmer and William Hartmann are the latest development in ongoing legal and other disputes over Michigan's election results as Republican President Donald Trump seeks to overturn results in key states that show Democrat Joe Biden winning the presidency with 306 electoral votes, compared to 232 for Trump. A total of 270 electoral votes is needed to win the presidency.

Palmer told the Free Press Thursday that Trump telephoned her Tuesday night, after the board meeting. She said Trump called to make sure she was safe after hearing about threats directed at her. The Associated Press, citing anonymous sources, reported Thursday that Trump also reached out to Hartmann.