More than 1 million COVID-19 vaccines have been administered in Iowa, but as the rollout continues some may be hesitant to take the shot.

State senators have advanced a bill that would bar Iowa businesses from requiring their employees to get vaccinated against the disease. The Iowa Senate Human Resources Committee approved the legislation and it was introduced to the full Senate on March 4 as Senate File 555.

It was during that committee meeting that one Republican, Sen. Jim Carlin of Sioux City, raised concerns about the risk of these shots.

The Fact Checker is checking three claims made by Carlin during that discussion. Carlin, who has announced he’ll run for the U.S. Senate seat now held by fellow Republican Chuck Grassley, did not respond to the Fact Checker’s request for his sourcing.