If you aren't careful, you'll force the RINOs to switch to the democrats and take control of the senate. The only solution is to primary the bastards.
Primary who doesn’t vote the way you want?
Why don’t you persuade the voters in the relevant state to vote the way you want. Then the senator will.
This doesn’t have much to do with senators. This is about their states. You want a more conservative senator from Maine? Get Maine to vote for one. Ditto Heller in Nevada, now a blue state.
Head on up to Alaska and get them to out kick her out. Except the other Senator from there is a Democrat so they aren’t all that reluctant to have another one. In which case you don’t get a more conservative position from Alaska.