Tom Horne doesn't like Bill Montgomery? That's possibly the nicest thing ever said about Montgomery.

From Arizona Capitol Times, written by Howard Fischer of Capitol Media Services -

Feud between 2 GOP officials clouds English leaner issue

A decade-old political spat between two Republicans could affect whether one Supreme Court justice can decide the legal way to teach English in Arizona schools to those who are not fluent.

In a surprise move, state Superintendent of Public Instruction Tom Horne has asked Justice Bill Montgomery to sit this case out. Horne’s attorney, Dennis Wilenchik, said it’s all because of actions by Montgomery when he was Maricopa County attorney — actions that, at the time, involved possible criminal charges against Horne.

Guessing that's a typo in the headline - they probably meant "learner", not "leaner".