Republican presidential nominee Donald Trump's transition team has tapped a top energy lobbyist with deep ties to Capitol Hill Republicans to help lead its energy and environment transition operations.

Mike Catanzaro, a lobbyist at CGCN Group, will be helping with preparations to implement Trump's policy agenda should the Republican nominee clinch the White House in November, according to a source familiar with the Trump transition. The news was first reported by Politico.

Catanzaro previously helped lead the environmental transition operation for Mitt Romney's campaign during the 2012 election. He was the top energy aide in then-House Speaker John Boehner's (R-Ohio) office from 2011 until 2012 and was previously a top staffer to Sen. Jim Inhofe (R-Okla.) on the Senate Environment and Public Works Committee.

He has executive branch chops and ties to the George W. Bush energy world, too. He was associate deputy administrator and chief of staff to then-U.S. EPA deputy chief Marcus Peacock during Bush's presidency and worked as associate director for policy at the White House Council on Environmental Quality in 2005.

Since he joined the GOP lobbying shop in 2014, Catanzaro's clients have included the American Fuel and Petrochemical Manufacturers, the American Chemistry Council, Devon Energy Corp., America's Natural Gas Alliance, General Motors Co., Koch Cos. Public Sector LLC and many others, according to lobbying disclosures.

"I think Catanzaro is probably one of the premier GOP policy analysts and political consultants that we have in this space, given his experience, breadth of experience and the level of his policy expertise," said the source familiar with the transition.

Catanzaro's addition to the team could also help win over some Republican energy insiders who have been hesitant about jumping on the Trump bandwagon.

Republicans who have been skeptical will look at Catanzaro's policy credentials, and "it's just going to make them feel better," the source said. "If the transition team is filled with people like that, I think that's going to provide some comfort to folks out there in the middle."

Catanzaro is one of several former Republican congressional staffers working in Trump's orbit of energy insiders. Former Inhofe aide Andrew Wheeler and Jeff Wood, a former energy aide to Sen. Jeff Sessions (R-Ala.), are advising the Trump campaign on energy issues, the source said.

The Trump transition team has been ramping up its operations in recent weeks, according to several sources.

Last week, Trump transition leader Gov. Chris Christie (R-N.J.) held a meeting with energy insiders in Washington, D.C., at a downtown lobbying firm, according to another source familiar with the transition effort. A cross-section of energy personalities attended, including lawyers, lobbyists and think tank representatives.

They discussed energy issues broadly and offered an update on the transition, and there was a light request for money for the transition effort, the source said.

The Trump transition operation is expected to continue to formalize operations and bring on more policy experts as the countdown to Election Day continues.

Catanzaro and the Trump campaign did not respond to requests for comment.

Reporter Hannah Northey contributed.