“1 of the warrants for Giuliani’s devices indicated..federal investigators were searching for communications between him & several Ukrainian officials, inc. former pres. Petro Poroshenko, & 2 frmr prosecutors who had helped Giuliani collect info about the Bidens in Ukraine,” https://twitter.com/kylegriffin1/status/1387480567520759808
“The investigative actions on Wednesday were expansive, with agents also serving a grand jury subpoena on Giuliani’s executive assistant, two people with knowledge of the matter said.”
FBI agents also executed a search warrant Wed. morning at home of Victoria Toensing, a lawyer close to Giuliani who had dealings with several Ukrainians involved in the hunt for info on the Bidens, acc. to people with knowledge of that warrant. The warrant was for her cellphone.
“Toensing...has also represented Dmitry Firtash, a Ukrainian oligarch under indictment in the United States whose help Giuliani sought.” and whom neither of them registered to represent
“Federal authorities have largely focused on whether Giuliani illegally lobbied the Trump administration in 2019 on behalf of Ukrainian officials and oligarchs, who were helping Giuliani’s dirt-digging campaign....

“It is a federal crime to try to influence or lobby the United States government at the request or direction of a foreign official without disclosing it to the Justice Department.”