Former top Chinese politician Bo Xilai has accused his ex-police chief of lying over allegations of abuse of power.
Mr Bo launched a scathing attack on Wang Lijun, his former associate in the central city of Chongqing, saying his testimony was "full of lies and fraud".
The trial, in its fourth day in the city on Jinan, was later adjourned until Monday.
Mr Bo, a former Communist Party chief in Chongqing, denies wrongdoing.
The BBC reports that the scandals involving Mr Bo's family have captivated the country.
Many analysts assume the outcome of the trial has been predetermined with a guilty verdict, however, observers say Mr Bo has put up a spirited defence.
Foreign media are not allowed into the trial, but the court in the eastern city of Jinan has been posting regular updates on China's micro-blogging site Weibo (in Mandarin).
On Saturday the trial focused on accusations that Mr Bo covered up the murder of UK businessman Neil Heywood in 2011.
Mr Bo's wife, Gu Kailai, has already been convicted of murdering Mr Heywood.
Mr Wang had been a key figure in court on Saturday, testifying that Mr Bo had punched him after he told the politician his wife was responsible for the death of Mr Heywood
But Mr Bo told the court on Sunday: "His character is extremely bad, he created rumours... and threw dust in the public's eyes.
Mr Bo is also accused of embezzling 5 million yuan in 2000 which had been earmarked for a construction project in Dalian. Mr Bo was the city's mayor in the 1990s.
But at Saturday's hearing he blamed his wife for this, saying he had no knowledge that she had taken the money until later on.