Democrats, GOP, Play Chicken Over Fiscal Cliff

But will they leap into the abyss?

Democrats and Republicans elevated their political brinkmanship Sunday on fiscal negotiations in Washington, with Treasury Secretary Timothy Geithner challenging Republicans to improve on his offer -- which Republicans dismissed as "non-serious" and an attempt to undermine negotiations.

Geithner, now President Obama's chief negotiator with congressional Republicans, told "Fox News Sunday" the White House plan has "balance" and "detail" but he's willing to hear suggested improvements.

"But what we cannot do is figure out what works for them," said Geithner, who appeared on all five major TV talk shows. "The ball really is with them now."