In 1993, Vue Mai, a former Hmong soldier and leader of the largest Hmong refugee camp in Thailand, who had been recruited by the US Embassy in Bangkok to return to Laos as proof of the repatriation programme's success, disappeared in Vientiane. According to the US Committee for Refugees, he was arrested by Lao security forces and was never seen again. Following the Vue Mai incident, debate over the Hmong's planned repatriation to Laos intensified greatly, especially in the United States, where it drew strong opposition from many American conservatives and some human rights advocates. In a 23 October 1995 ''National Review'' article, Michael Johns, the former Heritage Foundation foreign policy expert and Republican White House aide, labelled the Hmong's repatriation a Clinton administration "betrayal", describing the Hmong as a people "who have spilled their blood in defense of American geopolitical interests". Debate on the issue escalated quickly. In an effort to halt the planned repatriation, the Republican-led US Senate and House of Representatives both appropriated funds for the remaining Thailand-based Hmong to be immediately resettled in the United States; Clinton, however, responded by promising a veto of the legislation.