Washington (CNN) The Trump administration is making revisions to the naturalization test for the first time in a decade, US Citizenship and Immigration Services announced Friday.

The agency is focusing on changes to the civics portion of the test, though there could also be updates to the English section, according to a USCIS official.

The announcement comes amid a heated debate over who should be allowed in the country after President Donald Trump targeted progressive congresswomen, telling them to "go back" to where they came from. Three of the four women were born in the US. The other is a naturalized citizen.

As of March 2019, the overall national pass rate is 90%. In fiscal year 2018, nearly 757,000 people were naturalized, USCIS says.

The citizenship test, which immigrants must pass to become US citizens, was last revised in 2009. It features 100 civics questions . Hopeful American citizens are asked up to 10 of these during an interview and have to answer six correctly to pass.