Prosecutors plan to question Ichiro Ozawa on a voluntary basis for a fourth time over misreported funds, but not until after the Sept. 14 election for president of the Democratic Party of Japan, sources said Monday.

Ozawa, formerly secretary general of the DPJ, has said he is busy preparing for the election and hoped for the questioning to take place afterward.

In addition, he told prosecutors there could potentially be too much political impact on the DPJ race if the questioning takes place immediately beforehand, the sources said.