President Trump on Thursday blamed Democratic governors for hiding evidence of illegal voting from his now defunct Commission on Voter Fraud, and said only voter ID laws would help ensure that only legal citizens are voting around the country.

“Many mostly Democrat States refused to hand over data from the 2016 Election to the Commission On Voter Fraud. They fought hard that the Commission not see their records or methods because they know that many people are voting illegally. System is rigged, must go to Voter I.D.,” Trump tweeted.