ISLAMABAD - The United States has begun arm-twisting Pakistan over Raymond Davis row that has pushed bilateral ties between the two key partners in war on terror to the lowest ebb. To begin with its planned measures the US is actively considering deferring the crucial trilateral summit of the foreign ministers of the United States, Pakistan and Afghanistan slated for 23-24 February in Washington. Well-placed diplomatic sources told The Nation on Wednesday that the proposed conference was to discuss critical issues pertaining to the war ravaged Afghanistan with special focus of the US troops withdrawal as well as the post-withdrawal situation. Pakistan Foreign Office remained non-committal when this scribe approached the spokesman for comments. However, the acting spokesperson of the US Embassy confirmed to The Nation that the subject matter was still under review by the US government and no decision had been taken so far. She pointed out that the US congressional delegation comprising Buck McKeon (Republican, California), John Kline (Republican, Minnesota), and Silvestre Reyes (Democrat, Texas), which recently visited Pakistan and met with Prime Minister had actually initiated the move. During their meeting with Prime Minister Syed Yousuf Raza Gilani on February 4 they had demanded immediate custody of Raymond Davis, but the Prime Minister rebuffed it saying the matter was sub judice and would be decided by the court. The spokesperson rejected the media reports that the US had suspended all high-level dialogue with Pakistan after Islamabad refused to release an American diplomat detained on possible murder charges. We continue contacting with Pakistan to express the importance of resolving the case of a US diplomat in accordance with international law, she said. She also clarified that no US economic assistance to Pakistan was being suspended. Pakistan and the US have been entangled in a serious diplomatic row after Raymond Davis killed two Pakistanis in Lahore, and since the tragic incident the Washington has stepped up pressure on Islamabad to release the man without further delay on diplomatic immunity. But the Government of Pakistan resisted these attempts saying the matter was sub judice and the court will decide it.