The no-confidence resolution against Sri Lanka's justice minister, Wijeyadasa Rajapakshe was adopted by the United National Party's Working Committee at a meeting held on Friday.
UNP MPs accuse the minister of obstructing fraud and corruption investigations into the Rajapaksa regime.
The resolution was put forward by MPs Ashu Marasinghe and seconded Sydney Jayaratne, reported Colombo Page.
According to the paper, "the five-point resolution cited that Minister Rajapakshe had failed in his duties as the Minister of Justice, had failed to bring in new laws to tackle bribery and corruption as promised by the United National Front's manifesto; had failed to bring in laws which provide for criminally earned moneys to be given back to the agencies; the Minister is being blamed for the prolonged delay in the hearing of criminal cases; and that the Minister's conduct had brought the government and the United National Party into disrepute."