Van Wyk's Facebook page also indicates that six people have objected to his candidacy, largely due to residency concerns. Van Wyk has said that he lives in Clive and plans to move in Sully, which is part of Houst District 28.
The Secretary of State's Office has confirmed Van Wyk's withdrawal. This leaves Greg Heartsill as the sole Republican candidate in the race. Megan Suhr is seeking the Democratic nomination. Heartsill and Suhr were the House District 28 candidates in 2012.
We'll try to bring you more on this developing story.