Ghani fled the country on August 15 and reportedly took with him bags stuffed with cash.
Ghani has denied the allegations.
However, speculation has persisted, and US Congress asked Sopko’s team to investigate the allegations.
“We haven’t proven that yet. We’re looking into that. Actually, the Oversight and Government Reform Committee has asked us to look into that,” Sopko told a House of Representatives subcommittee.
SIGAR has long been investigating fraud, waste and abuse during the US’s presence in Afghanistan.
Sopko suggested to the House Foreign Affairs Committee, that oversees development aid, that the failure of the U.S. project shouldn’t have been a surprise, given rampant corruption and mismanagement.
“Corruption grew so pervasive that it ultimately threatened the security and reconstruction mission in Afghanistan,” he told the House panel.
The congressional hearing was one of a series looking at the chaotic U.S. withdrawal and the path forward. “We can apply the lessons learned in other conflict zones,” Representative Joaquin Castro, the subcommittee’s Democratic chairman, said.