ISLAMABAD (Online) - US Ambassador to Pakistan Cameron Munter called on PML-N President Nawaz Sharif here on Wednesday. The two discussed bilateral issues in the meeting, party sources said. Opposition Leader in National Assembly Chaudhry Nisar Ali and Ishaq Dar were also present on the occasion. Pak-US relationships have been strained after allegations made on Pakistan for supporting Haqqani network by top US military and civilian leadership.