Stocks took a leg higher Friday afternoon on comments from the White House that President Donald Trump is “optimistic” China will seek a deal with the U.S.

Wall Street stocks ended another tumultuous week with a brisk late rally as a top Federal Reserve official said the US central bank was prepared to intervene if strains in markets grew, and traders remained fixated on tariffs.

Volatility continued on Wall Street Friday morning. The Dow, Nasdaq and S&P 500 all opened lower, but then reversed course and gained ground as a wild week starts to come to an end. Stocks bounced in and out of positive territory Friday,