Sen. Ron Johnson, who is expected to take over as chair of the Senate Budget Committee from the late Lindsey Graham, could make life more complicated for Senate Majority Leader John Thune. Unlike his predecessor, Johnson is hardly a leadership ally. A fiscal hawk elected in the 2010 Tea Party wave, he’s more bullish about reconciliation bill and a major proponent of the SAVE America Act, which House Republican leadership says they’ll tack onto any forthcoming reconciliation bill—which Johnson would oversee from his new perch in the Senate. Thune, for his part, has repeatedly stated that Senate Republicans don’t have the votes to get Trump’s beloved proof-of-citizenship bill past a filibuster. He doesn’t believe they can slip the bill through the reconciliation process, either. And, in fact, he would prefer not to attempt a new reconciliation bill at all.