On January 23, the Republican National Committee’s Rules Committee passed some changes to the party’s presidential nomination process. The rules require that all delegates must have been chosen by 45 days before the start of the convention. Because it is expected that the next Republican national convention will be in June or July, this change means that presidential primaries in June cannot be used to choose delegates.
The date of the convention itself won’t be set for several more months.
It will be interesting to see what the Republican Party does about states that hold presidential primaries in June, especially the populous states of New Jersey and California. Republican legislators may try to move the primary dates, although both of those two states have Democratic majorities in the legislature. Otherwise Republicans in those two states will choose delegates via caucuses, and the presidential primaries will just be beauty contests. See this story. The full Republican National Committee will decide on January 24 whether to accept the recommendations of the Rules Committee.