John Huber, the U.S. attorney in Utah, was tapped in November 2017 by then-Attorney General Jeff Sessions to look into concerns raised by President Trump and his allies in Congress that the FBI had not fully pursued cases of possible corruption at the Clinton Foundation and during Clinton’s time as secretary of state, when the U.S. government decided not to block the sale of a company called Uranium One.

As a part of his review, Huber examined documents and conferred with federal law enforcement officials in Little Rock who were handling a meandering probe into the Clinton Foundation, people familiar with the matter said. Current and former officials said that Huber has largely finished and found nothing worth pursuing — though the assignment has not formally ended and no official notice has been sent to the Justice Department or to lawmakers, these people said.

The effective conclusion of his investigation, with no criminal charges or other known impacts, is likely to roil some in the GOP who had hoped the prosecutor would vindicate their long-held suspicions about a political rival. Trump, though, has largely shifted his focus to a different federal prosecutor tapped to do a separate, special investigation: U.S. attorney in Connecticut John Durham, who Attorney General William P. Barr assigned last year to explore the origins of the FBI’s 2016 probe into possible coordination between the Trump campaign and Russia.