WASHINGTON, March 29 (Reuters) - Republican Senator Rand Paul on Wednesday opposed efforts in Congress to ban popular Chinese-owned social media app TikTok, which is used by more than 150 million Americans. A small but growing number of Democrats and Republicans have raised concerns, citing free speech and other issues and have objected to legislation targeting TikTok as overly broad. Republican Senator Josh Hawley said this week he hoped to get unanimous consent for a TikTok ban bill. "Congressional Republicans have come up with a national strategy to permanently lose elections for a generation: Ban a social media app called...