Under SB 1198, the Idaho Republican Party, under its current party rules, would choose what Sen. Brent Hill called the "default option," that only registered members of the Republican Party could vote in its primary election. Unaffiliated voters could switch to Republican by use of same-day registration, but they would then be registered Republicans. However, at any time after the election, those voters could switch their affiliation back to non-affiliated, if they so chose. Those who are registered with another party, such as the Democratic Party, couldn't switch on Election Day; they'd have to make their switch by the end of the candidate filing period in March.