New York (AFP) – The US Congress is on the cusp of approving a nationwide ban on using TikTok on government devices because of perceived security risks — thrusting the hugely popular video-sharing platform into a delicate position over Washington’s ties to China. After a Senate vote last week, the US House of Representatives could this week adopt a law prohibiting the use of TikTok on the professional phones of civil servants. The measure would follow bans in nearly 20 US states, where Republicans have led the attack against TikTok, arguing that its ownership by Chinese firm ByteDance makes t…