Chen Guangcheng is a Chinese human rights activist known for his work fighting against state-sponsored forced abortions.<br />Harassed for years by authorities, he fled to the US Embassy in Beijing in April 2012, ahead of a visit by then-Secretary of State Hillary Clinton.<br />After a tense month of negotiations, he was brought to the US by the Obama administration. At the time, he expressed his gratitude.<br />However, CNN reports he appeared at the Republican National Convention Wednesday and sang a very different tune.<br />There, Guangcheng praised President Donald Trump and accused President Barack Obama of having a "policy of appeasement" towards Beijing.<br />Relations with Beijing have plummeted since Trump took office, who has made being tough on China a key plank of his reelection campaign.