Colorado Secretary of State Wayne Williams is reaffirming the integrity of the state’s elections system even as President Donald Trump alleges instances of voter fraud nationwide.

Williams, a Republican, said Colorado employs safeguards to make sure elections are secure.

“In Colorado, our clerks and our judges prevent the overwhelming majority of attempts to vote that are improper,” Williams said in a statement Wednesday. “Voter fraud is rare but it undercuts our confidence in democracy, which is why it is so critical to protect against.”

Instances of fraud related to elections in Colorado overshadowed some of the recent election.

Most notably, failed Republican U.S. Senate hopeful Jon Keyser became entrapped in controversy when a petition gatherer hired by a firm used by Keyser’s campaign was found to have forged several signatures. Maureen Marie Moss, 45, last week was sentenced to four years probation on each of the two counts and 250 hours of community service.

Also of note, a petition gatherer hired by a firm used by proponents of raising the minimum wage in Colorado pled guilty recently to forgery. Angelo Felix Abad, 61, was accused of forging at least one signature in placing the successful issue on last November’s ballot.

State lawmakers are likely to take a look at the fraud issue in the legislative session. The Secretary of State’s Office can verify names and addresses on a petition, but it does not have the authority to disqualify a potentially fraudulent signature. Lawmakers may try to change that.

But in terms of actual voting, Williams says the state has several protections in place, including participating in programs to identify individuals who might be registered to vote in more than one state, something Trump has specifically called attention to.

The state also obtains federal and state death records to remove those voters from the rolls; it works with law enforcement to ensure felons are not allowed to vote; it uses U.S. Department of Homeland Security data to identify non-citizens; and the state collaborates with the U.S. Postal Service in using change-of-address records to update its registration files.

In the past election, the secretary of state’s office said it rejected 21,408 ballots because the voter did not provide ID as required or did not include a signature or the signature did not match one on file.

Democrat Hillary Clinton won Colorado by 5 points over Trump.

The president appears to lack confidence when it comes to protections against voter fraud. He continues to push false claims that at least 3 million illegal immigrants cast ballots for Clinton. On Wednesday he called for an investigation into the issue.

Trump has gone as far as to suggest that he would have won the popular vote had those alleged undocumented immigrants not voted.

But Williams says there is nothing to fear.

“Successful voter fraud is rare but important to guard against,” Williams said. “Bank robberies also are rare, but banks still employ security guards and put the money in a vault.

“Voters can have confidence in Colorado’s election process.”