WASHINGTON — Elon Musk is leaving his government role as a top adviser to US President Donald Trump after spearheading efforts to reduce and overhaul the federal bureaucracy.

His departure, announced on Wednesday evening, marks the end of a turbulent chapter that included thousands of layoffs, the evisceration of government agencies and reams of litigation. Despite the upheaval, the billionaire struggled in the unfamiliar environment of Washington, and he accomplished far less than he hoped.

He dramatically reduced his target for cutting spending — from $2 trillion to $1 trillion to $150 billion — and increasingly expressed frustration over resistance to his goals. Sometimes he clashed with other top members of Trump's administration, who chafed at the newcomer's efforts to reshape their departments, and he faced fierce political blowback for his efforts.

Musk's role working for Trump was always intended to be temporary, and he had recently signaled that he would be shifting his attention back to running his businesses, such as the electric automaker Tesla and the rocket company SpaceX.

However, the administration officials were often vague about when Musk would step back from his position spearheading the Department of Government Efficiency, known as DOGE, and he abruptly revealed he was leaving in a post on X, his social media website.

"As my scheduled time as a Special Government Employee comes to an end, I would like to thank President @realDonaldTrump for the opportunity to reduce wasteful spending," he wrote.

A White House official, who requested anonymity to talk about the change, confirmed Musk's departure.

Agencies via Xinhua