KARACHI  - American Ambassador Cameron Munter held a meeting with President Asif Ali Zardari at Bilawal House here on Wednesday and discussed relations between the two countries, sources said. The meeting took place at a time when the US and Pakistan were going to hold high-level talks on resumption of Nato supplies. But the US stance on key Pakistani demand, seeking apology for Salala hit and halt to drone attacks was impeding progress.