Too many don't know that, by the end of 2020, Trump was "buying votes" by draining the Social Security trust fund. By suspending the tax, and pledging to suspend it permanently if re-elected, Trump put Social Security on a clock to run completely out of funds and stop paying all benefits by 2023.
Trump has said he could eliminate the tax if he is reelected without undercutting the retirement program or greatly adding to the deficit.