Groups representing Latino voters, a key component of any Democratic presidential candidate’s path to victory in 2020, are concerned Joe Biden’s campaign is operating under the assumption that they’ll support him for the nomination no matter what.

The former vice president has skipped a number of cattle-call events where his rival Democratic candidates have showed up and made their case for the Democratic nomination and the right to challenge President Trump in 2020. In May, Biden attended neither the California State Democratic Convention nor the Unity and Freedom Presidential Forum, held by immigration activist group FIRM Action. Nearly every potential Democratic front-runner attended at least one of those events, including long-shot candidates such as California Rep. Eric Swalwell.