In this photo taken July 6, 2016, Republican Presidential candidate Donald Trump and former House Speaker Newt Gingrich share the stage during a campaign rally in Cincinnati. (AP/John Minchillo)

Former House speaker Newt Gingrich said Thursday he will not serve in President-elect Donald Trump’s Cabinet.

“I want to be free to network across the whole system and look at what we have to do to succeed,” Gingrich said when briefly reached by phone. Holding a Cabinet post would have been “not physically doable,” he said.

The remarks from the former GOP presidential candidate, 73, came after he told McClatchy he intends to focus on “strategic planning” during the Trump administration rather than run a federal department. The former House speaker said he does not plan to hold any official role under Trump.

Gingrich’s name had been mentioned for health and human services secretary and secretary of state. An active surrogate for Trump during the campaign, the former Georgia Republican lawmaker was long expected to take a role in the administration.

“New Gingrich is going to be involved in our government,” Trump said on the campaign trail in July.