New Delhi, Feb. 21 :    New Delhi, Feb. 21:  Flashing a clear signal that neither Kashmir nor Pakistan are off the US radar screen, President George Bush tonight wrote to Pervez Musharraf calling for talks with India. 'President Bush has emphasised that dialogue is vital for resolving differences between the two countries,' agencies quoted a Pakistan foreign office statement as saying. It added that Bush 'also underlined the shared interests of the two countries in a peaceful and stable South Asia'. Bush's first official letter to Musharraf was handed to him this afternoon by US ambassador William Milam hours before Delhi was to take a decision on renewing the Kashmir truce. The letter comes as a morale-booster to the Musharraf regime after former President Bill Clinton's stern words in a national telecast last March. Clinton had then ticked off the military regime and demanded that Musharraf take immediate steps to restore democracy. Earlier, two of the four visiting US Congressmen - Indian caucus co-chairman Jim McDermott and fellow member David Bonior - left for Islamabad. McDermott and Bonior are both Democrats and had come to India in connection with the quake. The other two Congressmen, co-chairman Ed Royce and Joe Pitts, who are both Republicans, skipped the visit citing prior engagements. Royce had held talks with Hurriyat leaders yesterday. One of the objectives of the US duo visiting Pakistan appears to be bilateral developments following Delhi's ceasefire call. Islamabad could be asked to explain what steps it was taking to sustain the truce and how this could lead to the talks table.