This is why Trump is an ineffective president. He doesn't understand that the tReagan Republican coalition is built on an unspoken transaction that guarantees that blue collar workers vote for the party as long as Medicare, Medicaid, and Social Security isn't touched. This is why Congress won't do a thing.
The people around him don't grasp this because they've almost all to a man never seriously worked in politics before his presidential campaign. I exaggerate but barely.
Bill Clinton wanted to privatize Social Security until the Lewinsky scandal sidetracked him.
http://www.counterpunch.org/2004/10/30/how-monica-lewinsky-saved-social-security/Bush wanted privatization too, but Democrats were against it under a Republican President.
http://money.cnn.com/2005/02/02/retirement/stofunion_socsec/Obama also wanted to go after Social Security with a grand bargain from the catfood commission.
http://www.huffingtonpost.com/entry/barack-obama-grand-bargain-social-security-expansion_us_5751f92de4b0eb20fa0e0142So trying to weaken Social Security is a Presidential rite of passage just like bombing Iraq.