Tens of thousands of non-citizens have tried or made it onto voter rolls across the U.S. over recent years, according to an election watchdog’s analysis of data from several states.

Non-citizen voters have been found on voter rolls in North Carolina, Pennsylvania, Texas and Maricopa County, Ariz. In Georgia, there were non-citizens who attempted to register to vote but were placed in a pending status because there wasn’t evidence of their citizenship, so they didn’t make it onto the voter rolls.

“Pennsylvania has been covering up for years, the tens of thousands of aliens who got on the voter rolls there for 20 years,” J. Christian Adams, president of the watchdog group Public Interest Legal Foundation, told “Just the News, No Noise” TV show this week, while also saying acting Pennsylvania Secretary of State Al Schmidt “knows the truth and won’t tell it.”

In 2017, Schmidt, a Republican who was a Philadelphia city commissioner at the time, told a Pennsylvania Senate committee that there were over 100,000 matches of voter registration records to state driver’s license numbers with Immigration and Naturalization Service indicators.