washington proposal amend tax bill u.s. senate trigger automatically reverse tax cut new revenues fall short forecast could pressure businesses economy economy slow critics say wednesday trigger champion republican senator bob corker mean allay concern estimate 1.4 trillion tax bill would add 10 years 20 trillion national debt proposal tax cut bill would scale back recapture lose federal revenues strong economic growth fresh revenues promise bill supporters fail materialize come years trouble trigger would likely kick economic downturn say critics even republicans warn would weaken businesses consumers boost need exactly wrong time raise tax say william gale senior economics fellow brook institution washington think tank among republicans criticize proposal representative tom cole say like much ... may end tax increase economy unlike program unemployment insurance add household incomes bad time support consumer spend offset weak economy trigger would squelch business household spend reinforce downturn trigger innocuous dangerous gale say detail trigger would work sketchy certain would even make legislation senators begin debate thursday knowledgeable source say bill likely include trigger would reverse deep corporate income tax cut president donald trump advisers many trump fellow republicans congress say tax bill include slash corporate tax rate 35 percent 20 percent would boost economy raise new tax revenue sufficient offset deficit increase many republicans believe tax cut pay would fuel great economic growth democrats dismiss notion republicans express doubt corker conservative fiscal policy lobby trigger try ensure tax cut blow national debt senator jeff flake republican commit vote tax bill say wednesday comfortable legislation indications trigger provision would protect raise deficit republicans hold 52-48 majority senate afford lose vote among tax legislation economists business leaders advise raise tax recession economy typically need stimulate david mcintosh president conservative lobby group club growth say statement senator understand basic business principles truly care deficit understand trigger automatic tax increase actually harm economic growth tax trigger idea senate tax bill swiftly draw critics