(CNN) The Democratic National Committee's Rules and Bylaws Committee voted to remove "virtual caucusing" from Iowa's and Nevada's 2020 caucus plans on Friday, giving the states about two weeks to form an alternative proposal.

The move leaves Iowa -- which had planned to use only the vote-by-phone method to comply with the Democratic Party's rules to expand voting access in the caucus states -- in a particularly tough position.

Nevada's plans included in-person early voting, meaning the committee could find the state's plan in compliance without that element.

Last week, DNC Chairman Tom Perez issued a statement with the committee's co-chairs saying the vote-by-phone method didn't meet security standards set to avoid hacking or tampering.

"While today's decision is not unexpected, we are still disappointed," Iowa Democratic Party Chairman Troy Price said in a statement after the vote. "We continue to have confidence in the abilities of our vendors to enact this process, but if the DNC does not believe the virtual caucus can be secure, then we cannot go forward. With less than five months to go, we are continuing to explore as quickly as possible what alternatives may exist in order to securely expand accessibility for the 2020 caucuses."

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