President Donald Trump’s reelection campaign and other Republican election groups criticized tech giant Google on Tuesday for making it harder for political advertisers to target specific types of people.

The GOP groups said the changes will lead directly to suppressing voter turnout and would “disproportionately” hurt Republican candidates.

Google has said that, beginning in January in the United States, advertisers will only be able to target political ads based on broad categories such as sex, age and postal code. Currently, ads can be tailored to more specific groups, such as political affiliation.

But the Trump campaign and Republican groups said Trump has built the greatest digital operation in politics, so Google’s decision will “disproportionately impact both the Trump operation and all of the Republican candidates and organizations that derive strength from it.”

“Google should immediately reverse its decision in order to ensure they do not suppress voter turnout during both the Democrat primaries and the 2020 general election,” the GOP groups said.

Democratic political groups have also been critical of Google’s new policy. “Tech companies should not reduce the power of the grassroots just because it is easier than addressing abuse on their platforms,” said leaders of the Democratic National Committee and allied groups helping oversee Democratic congressional campaigns.