On December 17, 1968, Barbara was kidnapped and buried alive in a coffin in Georgia. Despite enduring three and a half days underground, she survived.
The imprisonment of Valizadeh was acknowledged to the Associated Press by the US State Department.
Opposition head Yair Lapid and National Unity Party head Benny Gantz have placed the blame for the leak of the documents fully on the prime minister.
Next week there will be a hearing on Meir's case in the Rhodes court.
A European arrest warrant has been issued against him on behalf of Romania on accusations related to participation in a criminal organization, a police official said on condition of anonymity.
The arrests were part of a large-scale operation carried out throughout the country and in conjunction with various border police units.
A spokesperson for the US State Department said "a US military member" had been detained in Venezuela.