Pinthongta is to testify before an AEC sub-committee investigating alleged tax evasion associated with the sale of Shin Corp to Singapore's Temasek Holdings last year.

The hearing is being held at the Office of the Auditor-General and the committee has prohibited outside-broadcast equipment from its grounds.

Live TV coverage of Panthongtae Shinawatra's visit to the panel on January 10 showed rowdy crowd scenes as supporters of the former prime minister showed up to cheer his son.

AEC spokesman Sak Korsaengruang said the Auditor-General's office was a government building and it was inappropriate to allow live broadcasts from it.

The spokesman said the office would ask police and soldiers to step security in anticipation that Thaksin's supporters would come to provide moral support for his daughter as well.

He pleaded for the supporters to stay away.

"They shouldn't come here because their presence could cause turmoil. The AEC has not asked Pinthongta here to be punished but to provide information to an official investigation," he said.

In a related matter, AEC chairman Nam Yimyaem said Thaksin Shinawatra's recent interviews with CNN would not result in charges against him being dropped.

He said Thaksin should be prepared to defend himself in court and not give interviews to the foreign media. The AEC has probable cause to prosecute him, he added.

Nam said it was for the Council for National Security to decide if Thaksin could defend himself in person.