The son of a senior US cabinet minister is among several foreigners working for civil society groups who have been banned from leaving Egypt.
Sam LaHood, the son of Transport Secretary Ray LaHood, was stopped as he tried to board a flight leaving the country.
His organisation,
International Republican Institute (IRI), was one of 17 recently raided by authorities.
IRI is a US-funded non-profit that encourages democratic governance.
Egypt's military government has vowed to investigate how pro-democracy and human rights organisations are funded, and has said repeatedly it will not tolerate foreign interference in the country's affairs.
In a raid in late December, Egyptian officials confiscated documents and computers at the non-government organisations (NGOs).
Mr LaHood found himself stopped from leaving Egypt when an official stopped him from boarding a plane in Cairo on Saturday, reports said.