Chalerm said he had returned from a wedding reception of a son of a senior police officer and he protested after he saw that Democrat Party leader Abhisit Vejjajiva talked about an issue irrelevant to the charter debate.
He said had he been drunk, he would not have remembered the meeting regulations of Parliament.
Chalerm said he was swaying while walking during the meeting because he has been suffering for more than three months from a disease that causes an imbalance in his ears.
He said he did not intend to intimidate Democrat MP Rangsima Rodrassamee when he walked towards her. He said he was simply teasing her without any intention to assault her.
He said he was older than Rangsima and Parliament was a sacred place so he had never thought about assaulting the female MP.
Chalerm said he was ready to face an investigation by the House committee on ethics but he has file defamation complaints with police against four newspapers to defend his reputation. The four papers are Thai Rath, Thai Post, Naew Na and Siam Rath. Chalerm ssaid he would withdraw the complaint against Thai Rath if it acts as his witness against Rangsima.