Less than one week after launch, the government's "Cash for Clunkers" program is in danger of stalling out. The reason? It has been too popular. Too many Americans were taking advantage, turning in old cars for big rebates on new, fuel-efficient vehicles. And the program was speeding toward its 25,000-vehicle, $1-billion cap. Now, Congress and the White House will have to decide whether to allocate more money. So tonight, we ask: Should this program be continued? Or has the government put enough money toward this particular cause? Tell us what you think. You can follow "Nightline" anytime on Twitter: http://twitter.com/Nightline.