Foreign Minister Surapong Tovichakchaikul insists the government is committed to fighting for disputed territory around the Preah Vihear temple.
Mr Surapong was responding to Sirichoke Sopha, Democrat Party MP for Songkhla, who labelled him a "defeatist" in a House session yesterday.
Mr Sirichoke said the public was disappointed with the minister, who was working under the orders of "the big boss", a thinly veiled reference to deposed prime minister Thaksin Shinawatra.
He implored Mr Surapong to put national interests before those of individuals.
He also accused the minister of having a defeatist attitude, highlighting an occasion when he told the media that Thailand could only lose or draw in the border row case.
"I want to know what this means. Why just raise the white flag? Why be such a coward?" Mr Sirichoke asked the minister.
In reply, Mr Surapong admitted Thaksin had advised him on how to proceed with the case, but insisted the government would not lose.
He said the Democrats should also ask themselves why their former leader MR Seni Pramoj lost the 1962 Preah Vihear case which awarded ownership of the temple to Cambodia.
Cambodia has asked the International Court of Justice (ICJ) to interpret its 1962 judgement. An area of 4.6 square kilometres surrounding the temple was not included in the ruling and is claimed by both countries.
Mr Surapong said the ICJ could deliver one of four different verdicts in the upcoming case, none of which would be favourable to Thailand.
First, the court may dismiss the case if it deems it has no jurisdiction over the matter. Secondly, the court could uphold its 1962 ruling.
These two scenarios would effectively mean a draw for Thailand, as the border dispute would remain unresolved.
But if the court accepts Cambodia's request for an interpretation on its 1962 ruling, it would be most likely to either rule in favour of Cambodia or make a neutral decision without favouring either country. Both of these outcomes would be seen as a loss for Thailand, Mr Surapong said.
Meanwhile, a group of 30 people calling themselves "White Doves" yesterday gathered at the Royal Thai Army headquarters to hand over a letter expressing support for army chief Prayuth Chan-ocha's position on the border dispute.
The general has refused calls from right-wing groups to reject the ICJ's pending ruling. The demonstrators also carried posters calling on the ASTV Manager newspaper to stop publishing stories that divert attention from serious issues, to stop warmongering, and to cease its ultra-nationalistic agenda.
The newspaper recently engaged in a war of words with Gen Prayuth over his border row stance, with the paper likening the general to "a woman on her period".
About the author
Writer: Mongkol Bangprapa & Wassana Nanuam