(Reuters) - Cleta Mitchell, a prominent Republican lawyer who participated in U.S. President Donald Trump's phone call pressuring Georgia's top election official to "find" enough votes to overturn his defeat in the state, has left the partnership at Foley & Lardner, the firm said Tuesday.

"Cleta Mitchell has informed firm management of her decision to resign from Foley & Lardner effective immediately," the firm said in a statement. "Ms. Mitchell concluded that her departure was in the firm's best interests, as well as in her own personal best interests. We thank her for her contributions to the firm and wish her well."

Mitchell did not immediately respond to requests for comment sent to her work email address and her LinkedIn account, or to a voicemail.

She had been a Washington, D.C., based political law partner at Foley. Her clients have included the National Republican Senatorial Committee and the National Republican Congressional Committee.

A widely publicized recording of the Jan. 2 call included audio of Mitchell, on Trump's behalf, asking Georgia officials for voter data and raising concerns that dead people and non-residents may have accounted for thousands of Georgia votes against Trump, allegations officials said they had investigated and found to be unfounded.

Foley & Lardner on Monday said it was "concerned by" Mitchell's participation on the call and that it was "working to understand her involvement more thoroughly."

The firm said that it was "not representing any parties seeking to contest the results of the presidential election," a policy it said it decided in November, but that its attorneys were allowed to observe recounts and engage in similar activities as private citizens so long as they did not act as legal advisers.

White House chief of staff Mark Meadows said on the recorded call that Mitchell "is not the attorney of record" for Trump on Georgia election matters "but has been involved."

Law firms that have advised Trump or his allies on election related litigation, including Jones Day and Porter Wright Morris & Arthur, have faced blowback, including law student boycotts and client concerns. The Lincoln Project, a group of anti-Trump Republicans, in November pledged to spend $500,000 on ads targeting the firms.

The Lincoln Project on Sunday posted on Twitter Foley & Lardner's Milwaukee and D.C. office phone numbers and urged its 2.7 million followers to call the firm and tell it how they felt about Mitchell's presence on Trump's phone call to Georgia officials.

Milwaukee-based Foley & Lardner, which has more than 1,100 lawyers, then faced a flood of comments on its social media accounts.