Google's top lobbyist Mark Isakowitz is departing the company, leaving the tech giant without one of its most prominent Republican executives shortly before President-elect Donald Trump steps into office for a second time.

Isakowitz told Google staffers he has "been given a precious opportunity to play a role in government at an important time," according to an email obtained by Bloomberg News. Isakowitz will become chief of staff to incoming Republican Senator-elect Dave McCormick of Pennsylvania, McCormick's office said. Axios earlier reported that Isakowitz had been hired for the Senate job.