Washington (CNN) Environmental Protection Agency Administrator Scott Pruitt is drawing scrutiny for his housing situation and travel practices, but in his role as the nation's top environmental official, he's a reliable administration foot soldier, making good on President Donald Trump's campaign promises for fewer environmental regulations and to withdraw from the Paris climate agreement.

Since he was confirmed to the job last February, Pruitt has taken an aggressive approach to rolling back Obama-era regulations, most recently this week's announcement that he would revise fuel efficiency rules designed to cut back on emissions of greenhouse gases.

"This is another step in the President's regulatory agenda, de-regulatory agenda ... a billion dollars in savings with respect to over 22 significant regulatory actions that we've been involved in here at the agency," Pruitt said at EPA headquarters Tuesday

The announcement is the latest in a series of moves by Trump and Pruitt to dismantle Barack Obama's environmental legacy, moves that have drawn some scrutiny for their pace and breadth.

In the 14 months since he became the nation's top environmental policy official, Pruitt has bit-by-bit overseen the dismantling of a number of regulations and agreements across the agency, and impacting a wide range of issues.

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