(CNN) - Longtime Rep. John Conyers, D-Michigan, will not appear on the state's August 5 primary ballot, a local county clerk said Tuesday.
Conyers, who's held the seat for nearly five decades, did not have enough signatures on his nominating petition for his name to appear on the ballot, though he can still run as write-in candidate.
"Seeing that I do not have the authority to rule on the constitutionality of laws and statutes, that the County Clerks are bound by, it is my determination that in accordance with the current laws and statutes of the State of Michigan, the nominating petitions filed by Congressman John Conyers, Jr. are insufficient to allow his name to appear on the August 5, 2014 Primary Ballot," said Wayne County Clerk Cathy Garrett in a statement, obtained by CNN affiliate WDIV.
First elected in 1964, Conyers represents Michigan's 13th Congressional District. He is ranking member on the Judiciary Committee and founder of the Congressional Black Caucus.
He's also the second-most senior member of the House behind Rep. John Dingell, also from Michigan, who announced earlier this year he would retire after serving 58 years in the House.
The Democratic Congressional Campaign Committee said it’s confident he will be re-elected.
“The DCCC fully supports Representative Conyers in his re-election campaign, and I have every confidence that when this long process is complete, Representative Conyers will continue to serve the people of Michigan in Congress. As the next Dean of the House, the Michigan delegation and pillar of the Democratic Party, Representative Conyers will remain one of the most respected voices in Congress," DCCC Chairman Steve Israel said in a statement.
Conyers' campaign said Wednesday it will pursue its case that the incumbent should still be placed on the primary ballot.
"There is clear Supreme Court and federal court precedent overturning petition residency laws and requirements, and we are confident that those laws will be invalidated in Michigan as well. As a result, under existing precedent, we believe Representative Conyers will ultimately be placed on the August ballot," said state Sen. Bert Johnson, the chair of Conyers' re-election campaign.
CNN's Deidre Walsh and Dana Davidsen contributed to this report.