President Joe Biden's victory lap for his climate change and prescription drug prices law took a stumble on Tuesday as he celebrated its passage at the White House while the stock market had its biggest tumble in two years. As Biden spoke, the Dow lost more than 1,250 points and the S&P 500 sank 4.3% after Tuesday's report that inflation remained essentially stagnant in August. 'We're making progress,' Biden said in his speech on the South Lawn of the White House. But he acknowledged there was work to be done: 'We're getting other prices down as well. We have more to do. We're getting there.'