Taipei, Taiwan (AP) -- Thousands of people marched in Taipei's streets on Sunday demanding the reversal of a decision to allow U.S. pork imports into Taiwan, alleging food safety issues. President Tsai Ing-wen's administration lifted a long-standing ban on U.S. pork and beef imports in August, in a move seen as one of the first steps toward possibly negotiating a bilateral trade agreement with the U.S. The ban is due to be lifted in January. That decision has met with fierce opposition, both by the opposition Kuomintang party and individual citizens. The new policy allows imports of pork with acceptable residues of ractopamine, a drug added into animal feed that promotes the growth of lean meat that some farmers use in pigs. The drug is banned by the European Union, but is legal in the United States. Demonstrators marched in front of the Presidential Office Building as part of an annual labor march. “I came here today to oppose the import of ractopamine," said Kelvin Chen, a 54-year-old computer engineer who was marching. "I feel these days many who do business are not ethical. If they mix the U.S. pork with Taiwan pork and then sell it to us average consumers, we as individuals have no way to know the source of the pork.” “I have a child and when we eat things with ractopamine, it's not good for our bodies,” said Jacky Tsui, a 37-year-old factory worker. “I hope the government can see that we citizens oppose this.” Associated Press videojournalist Taijing Wu contributed reporting. Subscribe to our YouTube channel: https://bit.ly/2TwO8Gm Bloomberg Quicktake brings you live global news and original shows spanning business, technology, politics and culture. Make sense of the stories changing your business and your world. To watch complete coverage on Bloomberg Quicktake 24/7, visit http://www.bloomberg.com/qt/live, or watch on Apple TV, Roku, Samsung Smart TV, Fire TV and Android TV on the Bloomberg app. Connect with us on… YouTube: https://www.youtube.com/user/Bloomberg Breaking News on YouTube: https://www.youtube.com/c/BloombergQuickTakeNews Twitter: https://twitter.com/quicktake Facebook: https://www.facebook.com/quicktake Instagram: https://www.instagram.com/quicktake