Updated: 7:25 p.m. | Nine-term Ohio Republican Rep. Steven LaTourette will not run for re-election in November, a Republican source confirmed to Roll Call.

The news, which came as a surprise to political observers from Washington, D.C., to Ohio, was first reported by the Columbus Dispatch. The report said he was leaving over a dispute about future committee assignments. LaTourette is considered a close confidant of Speaker John Boehner (R-Ohio).

LaTourette is expected to make his retirement announcement Tuesday at a 10 a.m. press conference at his district office in Painsville. A GOP source said the Congressman will have the option to not submit his official letter of retirement to Ohio’s governor until after Aug. 8. That would avoid having another primary and allow the GOP replacement nominee to be chosen by a group of party officials from each county in the district.

LaTourette’s reconfigured 14th district slightly leans Republican, and the seat could be in play this fall depending on the strength of the candidate who replaces him on the ballot. Ohio’s primary was in March and therefore party nominee have already been set. The Democratic nominee in the district is Dale Blanchard, who does not appear to have filed with the Federal Election Commission.