Wichita ? Kansas Secretary of State Kris Kobach traded barbs this week over social media with Democratic presidential candidate Hillary Clinton on voting rights.

The spat was sparked by Kobach’s proposal for an administrative rule that would allow him to throw out any incomplete voter registration forms after 90 days, most of which lack proof-of-citizenship documentation such as a birth certificate, passport or naturalization papers.

Kobach, the architect behind some of the nation’s strictest voter ID requirements, has called his proposal “a common-sense” administrative rule that will save taxpayers money.

Clinton’s campaign late Monday posted a comment on Twitter: “Purging 34,000+ voters from Kansas elections is no administrative rule — it’s a targeted attack on voting rights,” and included a link to a story from The Associated Press about the move.

Purging 34,000+ voters from Kansas elections is no administrative rule—it's a targeted attack on voting rights. http://t.co/gz5VZPjMrB

— Hillary Clinton (@HillaryClinton) August 25, 2015

Kobach responded Tuesday on his personal Facebook account, saying his plan is not a purge as “left-wing knuckleheads” claim because those people just have to fill out a voter registration form again.

“Oh the horror! Hillary is getting her pantsuit in a twist over nothing,” he wrote.

https://www.facebook.com/SecretaryKrisKobach/posts/10153023672882344

Purging the suspension list, which had 34,454 names as of last week, would leave just 4,202 suspended voters on it who had registered within the last 90 days.

A hearing is set for Sept. 2 in Topeka over the proposed rule.