Scott Perry battles DoJ over work with Trump allies to overturn 2020 election

"A member of Congress has a legitimate privilege under the speech or debate clause, which prevents a member from being questioned about legislative matters," former US attorney for eastern Michigan Barbara McQuade told the Guardian. 

"That extends to measures stored on their phones. But that does not mean that a member of Congress can never be questioned or investigated. Text messages on the cellphone could provide evidence of criminal intent in efforts to thwart the outcome of the election."

https://www.theguardian.com/us-news/2023/feb/23/trump-ally-scott-perry-justice-department-phone