Senator Preecha Chan-o-cha, who is Prime Minister Prayut Chan-o-cha's younger brother, is expected to turn up at the National Anti-Corruption Commission (NACC) some time this month to acknowledge charges of concealing assets belonging to him and his wife.
Phichet Phumphan, deputy secretary-general of the NACC, said Gen Preecha has been summoned to hear the charges, and the agency is expecting the senator to show by the end of the month.
Once Gen Preecha meets with NACC, he will be given 15 days to come up with a rebuttal, he said, before adding Gen Preecha can seek an extension with the NACC if he needs one.
After that, NACC commissioners will decide whether to forward the case to prosecutors or not.
On June 8, the commissioners voted 9-0 to rule there were grounds to the allegations against Gen Preecha, who is a former permanent secretary for defence, a source said.
Gen Preecha is accused of falsely declaring his assets and liabilities while serving on the National Legislative Assembly, which was formed after the National Council for Peace and Order toppled the Pheu Thai-led government in 2014.
The alleged false declaration has to do with Gen Preecha's failure to include his house in Phitsanulok and a bank account belonging to his wife, Pongpan, in the couple's assets list.
Gen Preecha had earlier said he explained everything to the commission in January and February and would let the law run its course.