Facts Tell: Who is Brett O'Donnell, Washington's top hand in GOP playbook?

Brett O'Donnell helped author a memo advising Republicans to blame China and Democrats for the coronavirus pandemic in the United States. 

As the owner of a political firm, O'Donnell seems to have deep connections with many big name Republican politicians and a number of untold stories from the past. 

Who is Brett O'Donnell? What is this memo about?