Prime Minister Manmohan Singh sought the confidence of the Lok Sabha on Monday and said the trust vote was avoidable as he had promised to return to Parliament before operationalising the contentious nuclear deal with Washington.

"It (trust motion) was fully avoidable," Manmohan Singh said as he moved the one-line motion seeking the trust of parliament for his government -- reduced to minority after the Communist Party of India-Marxist (CPI-M)-led Left parties withdrew their legislative support in protest against the government's move to carry the India-US civil nuclear deal forward.

"I have repeatedly assured all, including the Left parties, that I myself would come to the guidance of parliament before operationalising the nuclear deal, if we were allowed to go to the IAEA (International Atomic Energy Agency) to finalise the India-specific safeguards agreement)," said Manmohan Singh.

He said he regretted that the government had to seek a trust vote at a time its attention was on the economy, especially on controlling inflation and "implementing the welfare programmes for the people, particularly the farmers".

Interestingly, the prime minister was not expected to speak after moving the trust motion. According to his personal aides, Manmohan Singh, who arrived at his parliament house office at around 10.30 a.m., wrote the brief speech himself.

The prime minister reiterated that he and his government had taken all the decisions in the best interests of the Indian people.

"I assure the house and the country that every single decision, every policy decision was taken in the fullest confidence that it was in the best interest of the people of the country."

After moving the motion - "that this house expresses its confidence in the council of ministers" - Manmohan Singh reminded the house that unlike his predecessors it was for the first time his United Progressive Alliance (UPA) government that had completed four years and two months in office was facing a trust vote.

In what is being seen as a snipe at the CPI-M's present leadership, especially its general secretary Prakash Karat, Manmohan Singh praised the "sagacity, wisdom and visionary leadership" of communist veterans Jyoti Basu and Harkishan Singh Surjeet who he said were the architects of the coalition government.

The prime minister also cited Guru Gobind Singh for showing his determination to go ahead without being scared of the repercussions.