The president warned that he would reject any effort to tie extraneous issues to an extension of the payroll tax cut, including the approval of a controversial oil pipeline between the U.S. and Canada. Obama stopped short of issuing a veto threat, saying he did not believe lawmakers should let it come to that.

Source: http://www.npr.org/2011/12/07/143317652/obama-to-gop-dont-tie-pipeline-to-tax-cuts?ft=1&f=1014

Mike Enzi Dick Durbin Johnny Isakson Jim Webb Richard Blumenthal Jeff Sessions Tim Johnson Tom Carper