Labor and civil rights activist Dolores Huerta has endorsed Joe Biden for president, giving him the backing of one of the nation’s most prominent Latino leaders.

Friday's endorsement comes as the Biden campaign says it’s ramping up Latino outreach. The campaign is expanding some of the efforts it launched in key states during the primary in an effort to strengthen Biden’s support with a voting bloc it acknowledges could be pivotal to his success in November.

The former vice president initially struggled to win over Latino voters during the primary after facing criticism for the Obama administration’s record on immigration.