U.S. dollar started the week on the back foot. GBP/USD closed last week right on the 200 DMA but moved north of it in early hours today. 1.36 - 1.3630 is the area where it gets interesting though. A move above that should see at least some short-covering. On the flipside, a sustained move below the mentioned average and then 1.35 will be needed for the bears to maintain control.