It is on the table and has been discussed along with taking away the exception for your employer's payment of a portion of your medical insurance (which turns out to cost the Feds more than the Mortgage interest deduction).  A Republican in Congress has said that cutting the corporate tax rate by 20% and the top bracket personal rate by 13% would cost too much to leave money for even a small tax break to the middle class. He said we would need to raise the capital gains rate or create a new tax for the top brackets. He noted that part of the problem is that cutting deductions from the rich to balance big cuts will also raise tax costs for the middle class because they also use those deductions. If one wants economic growth, leave the top personal rates where they are, give a small break to corporations based on the low effective rate they already pay which is more like 15% than 35%. Then give a substantial rate cut to the middle class and the economy would grow almost immediately.