On February 19, the Alabama Republican Party barred three legislative candidates from its May 24 primary. Alabama case law allows parties to bar candidates from running in its primary for reasons having to do with political stances and association.
Tripp Powell was barred from running for State Senate because in 2018, he donated $500 to the Democratic nominee for Governor.
Anson Knowles was barred from running for State House because at some time in the past, he was chair of the Libertarian Party of his county.
It is not known why the Republican Party barred Teresa Rhea from running. See this story.