Delivery Hero's first trading day as DAX company
"At that point of time, the chancellor should not have lobbied in favor of the company, but rather the prosecutor and the police should have marched in and searched the premises of the company," he said.
Merkel will be summoned to testify on April 23, a day after Scholz, the candidate whom the center-left Social Democrats (SPD) have tipped to succeed the Christian Democrat Merkel after the national election this year.
Toncar also told DW that Scholz's ministry failed to avert the scandal.
"Most of the political responsibility lies with the Ministry of Finance, the ministry of Olaf Scholz," said Toncar, a lawyer who specializes in international finance and a member of the parliamentary inquiry investigating the Wirecard insolvency.