LAHORE - US Ambassador Anne W. Patterson on Thursday called on PML-N Quaid and former PM Mian Muhammad Nawaz Sharif at his residence in Raiwind. The meeting was part of wide range of talks with US diplomats on issue of mutual interest. US envoy and Nawaz Sharif discussed economic and political issues and cooperation between the US and Pakistan in the global war on terrorism. She also talked to Nawaz about energy crisis giving some suggestions how Pakistan could cope with the situation. She said that US was interested to invest US $30 million. Earlier, Canadian High Commissioner David Koliens met PML-N Quaid Mian Muhammad Nawaz Sharif and discussed issues including social and economic ties between both the countries. Online adds: Nawaz Sharif has said that there would be no compromise on the restoration of deposed judges. According to sources, the US Ambassador exchanged extensive views with Nawaz Sharif on the current political situation and the judge issue. However, no pressure was exerted on the PML-N leader in this regard. Nawaz told the US ambassador that no compromise would be made on the judges  issue as an independent judiciary is vital for the stability of the country. Monitoring Desk adds: Nawaz Sharif has said that Pervez Musharraf is still busy in pulling out legs of the elected government and efforts are under way to make PML-N sit in the opposition. "Conspiracies and plots have been prepared to derail the democratic system, and now, it is the duty of all politicians including PPP Co-Chairman Asif Zardari to avoid this trap," he said. In an interview with a private TV channel Thursday, Nawaz said that Pervez Musharraf was looking for an opportunity to end this government, and "I have cautioned Asif Zardari repeatedly in this connection". He said his party would not do anything that might endanger the sitting government, because it would enable a dictator to exploit the situation. To a question, Nawaz said that his party would play its due role in judges' reinstatement, as it had been promised with the nation in February 18 elections. Ruling out any possibility of alliance with PML-Q, Nawaz said that those who betrayed the nation, compromised on national interests and supported a military dictator could not be accepted back.