By Jonathan Paye-Layleh
BBC correspondent in Monrovia
Liberia's ex-President Gyude Bryant has been questioned by police on allegations of corruption committed during his two years in office.
Gyude Bryant led Liberia through a two-year peace process
Mr Bryant headed the country during a transitional phase after the end of the 14-year civil war in 2003.
His government is accused by the regional body Ecowas, which oversaw the peace process, of stealing state funds.
He told the BBC that he had expected the probe on graft but not to have his other decisions questioned too.
President Ellen Johnson-Sirleaf came to power a year ago promising to crack down on corruption.
Liberia's solicitor general said everyone named in the Ecowas report will be investigated as "million and millions of dollars" had gone missing.
"Justice will be done without exception," Tiawan Gonglo told reporters.
After sitting before the investigation board Mr Bryant told the BBC he was disappointed with some aspects of the process.
"I did not expect that my executive decisions would be investigated.... [I am] disappointed because I see a constitutional crisis looming in our country."
The full-scale investigation is set to start on Monday.