WASHINGTON — Emmet T. Flood, the White House lawyer who oversaw the administration’s response to the special counsel investigation into the Trump campaign’s ties to Russia, will step down from the job this month, President Trump said on Saturday.

The departure of Mr. Flood, who first rose to prominence when he defended President Bill Clinton during his impeachment in the 1990s, was always expected. Though Mr. Trump had considered Mr. Flood for other positions in the administration — including as White House counsel — Mr. Flood had always made it clear he wanted his purview limited to the Mueller investigation.

“He has done an outstanding job – NO COLLUSION - NO OBSTRUCTION! Case Closed!” Mr. Trump said on Twitter from his golf club in Sterling, Va. “Emmet is my friend, and I thank him for the GREAT JOB he has done.” The president added that Mr. Flood would leave his post on June 14.

After turning down overtures to work at the White House, Mr. Flood joined the administration last spring, rounding out a seemingly ever-changing cast of lawyers who tried and failed to assure the president that the investigation would end quickly. Mr. Flood oversaw a more emboldened strategy as the president grew more comfortable with publicly maligning the special counsel, Robert S. Mueller III.