(CNN) This story originally published on April 6, 2018, and has been updated with more developments. Pruitt submitted his resignation on July 5, President Donald Trump tweeted.

A steady stream of negative headlines involving Environmental Protection Agency Administrator Scott Pruitt in recent weeks and months had official Washington wondering how long the embattled agency head would hold on to his job.

Pruitt came to Washington already a controversial figure, and since taking the helm of an agency he once battled, he has faced a series of inquiries and bruising accounts of his conduct in office and use of official resources.

At the same time, Pruitt worked to carry out key elements of President Donald Trump's agenda, overseeing a rollback of Obama-era environmental regulations on climate change and pollutants. But all the while, he has been caught up in a series of unfolding controversies over everything from first-class travel to security expenses and a decision to rent a room in Washington tied to an energy lobbyist.

Ultimately, Pruitt resigned July 5 as the controversies mounted.