There is speculation in France that Ms Lagarde could yet be placed under formal investigation in this case, he adds.

BBC: French court summons IMF chief over Bernard Tapie probe

Ms Lagarde has yet to be placed under formal investigation in the case and has denied any wrongdoing.

BBC: IMF 'has confidence' in Christine Lagarde

The status of assisted witness is far less damaging for Ms Lagarde than if she had been placed under formal investigation, which could have put her under pressure to resign, the BBC's David Chazan reports from Paris.

BBC: IMF chief Christine Lagarde key witness in Tapie case

Lagarde acknowledges the IMF made ''significantly different'' policy recommendations under her predecessor, in the euro zone as well as in a few developing countries.

FORBES: Page 3 of 3

However, our correspondent says that Ms Lagarde's position at the IMF could be in jeopardy if she is placed under formal investigation.

BBC: IMF head Lagarde's flat searched in Bernard Tapie probe