WSJ:

Donald Trump’s first attempt to seize some control over the Republican National Committee and the course of the GOP convention is creating a showdown over a little-noticed election for a powerful internal post that helps determine who can become a delegate to the party’s convention.

On Friday, Virginia Haines, an RNC committeewoman from New Jersey, resigned her post as one of nine members of the party’s Committee on Contests, which has initial jurisdiction in settling disputes over which delegates can be seated at the GOP national convention in July.

Mr. Trump’s campaign has been stung by rival Texas Sen. Ted Cruz’s ability to get his supporters elected as convention delegates—even in states where the businessman won the primary or caucus.

With Ms. Haines’s resignation from one of two slots dedicated to the Northeastern states, Mr. Trump’s allies are now waging a fierce battle against two other RNC members seeking to replace her, one of whom has expressed anti-Trump sentiment and the other has claimed neutrality in the internal showdown.