Comcast ( CMCSA ) dragged on the Nasdaq Composite after the company announced its bid for European entertainment firm Sky. Wall Street lost ground on Tuesday, with the Dow Jones Industrial Average and the S&P 500 halting a three-day run of gains as Federal Reserve Chairman Jerome Powell was seen in testimony to lawmakers in Washington, D.C. as hinting at more rate hikes than previously seen this year. In his Congressional testimony debut as chairman, Powell said he's seen some data that adds confidence to the view that inflation is moving near the 2% target.