Former Vice President Joe Biden on Wednesday pledged not to hold migrant children in detention centers if elected president, according to several lawmakers who met with him in Washington on Wednesday.

Biden’s commitment came during a conversation about migrant detention centers in a closed-door meeting with more than 20 members of BOLDPAC, a political action committee that helps bankroll the campaigns of members of the Congressional Hispanic Caucus.

Biden did not offer any further details on what he exactly he would do with the thousands of young migrants currently housed in facilities run by the federal government and private contractors. The specific changes he would make to the current system of migrant detention also remain unclear.