An aide to Thailand’s prime minister said he would seek the expulsion of human rights group Amnesty International from the country, after it was accused by ultra royalists of undermining national security.Seksakol Atthawong, a vice-minister in Prime Minister Prayuth Chan-ocha’s office, said on Friday that a petition opposing Amnesty’s presence in Thailand had garnered 1.2 million signatures and would be submitted to the National Security Council and Interior Ministry next week.Thai protesters…