 Some Republicans thus criticized the idea for increasing the national deficit.Some Democrats were also wary of the notion, either because they thought the return to the normal rate one year hence would be characterized as a politically unpalatable "tax hike", or because they feared that reductions in the payroll tax would undermine the basic model that Social Security was based on.On December 15, the Senate passed the compromise package with an 81–19 vote, with large majorities of both Democrats and Republicans supporting it.