The dollar was on-pace to record another weekly decline Friday - - undoing the gains against the euro and pound earlier this summer- - as traders and analysts debated the likely next step for the U.S. Congress and/or the U.S. Federal Reserve on the heels of possible additional massive, mortgage-asset-related write-downs by Fannie Mae and Freddie Mac.

The dollar traded at about $1.5888 to the euro Friday at mid-day, down about 1 cent, and also within about 1 cent of an all-time low versus the euro. The dollar also traded at $1.9878 to the British pound, also down about 1 cent, and off about 1 yen to 106.09 versus Japan's yen.

Currency trader Andrew Resnick said that given the dollar's decade-long slide versus the world's other major currencies, it's difficult to fathom further dollar declines, but that's what the economic fundamentals suggest.

"From one perspective, you have to ask, at what point do central bankers say the dollar's slide poses serious risks of commodity prices rises and inflation, with negative consequences for global growth?" Resnick. "On the scale of competing demands, you can make a strong argument that the dollar can not be permitted to slide much further."

However, Fannie Mae (NYSE: FNM) and Freddie Mac (NYSE: FRE), which face additional losses, Bloomberg News reported Friday, could come under full control, also called conservatorship, of government regulators, or receive bridge loans from the U.S. Congress or the Fed, Resnick said, absent a private equity investment. In any event, if Fannie's and Freddie's additional losses hit key levels, "we're looking at another enormous government obligation, and that's not good news for the dollar," Resnick said. "It means more dollars in circulation, which combined with the weak U.S. economy, will drive the dollar lower."

Resnick added that he presently is short with the dollar in the euro / dollar, British pound / dollar, and yen / dollar currency pairings.