Donald Trump is seizing on his party’s frustration with the recent surge of illegal crossings at the southern U.S. border to churn up fears around another top GOP concern — voter fraud. In the final stretch before Iowa’s caucuses next Monday, the former Republican president has repeatedly suggested that Democrats are encouraging migrants to flow into the country illegally in order to register them to vote in the 2024 election. The unsupported claim, which Trump and other Republicans have carted out in past election years, is resonating with voters who agree that security is lacking at both the border and the polls.