Democrats have a chance to win big in this year’s midterms by channeling Latino voters’ anger at President Donald Trump’s immigration and health care agenda, according to the findings of a Democratic-funded study released Tuesday.

But first, they’ll have to convince Latinos their vote will mean something.

The study found “significant challenges for Democrats” in convincing Latino voters that a Democrat-controlled Congress would affect important changes. But there is “also an immense opportunity” for Democrats to mobilize Latinos who oppose the Trump administration’s policies and rhetoric, the authors said.

Political polling firm Latino Decisions conducted the research, which was commissioned by three top Democratic fundraising groups: the House Majority PAC, Priorities USA and the Congressional Hispanic Caucus Bold PAC.

Latino Decisions analyzed opinion data from focus groups and a poll of 1,000 Latino registered voters. They found Latino voters are “exceedingly angry at the state of politics today,” particularly regarding the Trump administration’s hard-line immigration policies and health care rollback efforts.