Bruno Le Roux has been placed under preliminary investigation for hiring his two teenage daughters as parliamentary aides.
The second rise in three months comes in the wake of steady economic growth, strong job gains and confidence that inflation is rising to the central bank's target.
The former prime minister saw his ratings drop after prosecutors opened an inquiry into accusations that he gave large amounts of taxpayers' money to his wife and two children for "fake jobs."
Erdogan says each firm should hire one jobless person while addressing business leaders in a speech.
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