By Alina Selyukh WASHINGTON (Reuters) – DirecTVs chief executive officer told lawmakers on Tuesday that the largest U.S. satellite television provider needs to merge with ATT Inc so that it can offer Internet service to consumers that is critical to remaining competitive. Weve competed aggressively by delivering more high-definition channels, a clearer picture … than cable, CEO Michael White said at a hearing on the proposed $48.5 billion merger before the House Judiciary Committee. If we want to continue to compete effectively in todays Internet-driven economy, we must adapt as well. ATT CEO Randall Stephenson reiterated his companys assurances to the Federal Communications Commission earlier this month that the merger would combine the two companies complementary products to offer the bundles of video and broadband services that consumers increasingly want.