[1][2] Hagenbuch is a Navy Veteran and previously served as the Denton County Republican chair.
[3] Hagenbuch announced his candidacy at the end of November 2023, for the open Senate District 30 seat that was being held by Drew Springer.
[5] Controversy began soon after his announcement, debating about the residency of Brent among the other candidates in the Republican Primary Election, who wanted to remove him from the ballot.
[6][7] Towards the end of January 2024, a judge allowed Hagenbuch to continue campaigning amid questions about his eligibility.
[10] Questions about Brent's residency continued up to the general election, including from his democratic opponent.