He tried to do it when he was President. And Medicare and Medicaid as well.
Trump said he wouldn’t cut Medicaid, Social Security, and Medicare. His 2020 budget cuts all 3.
President Donald Trump’s 2020 budget breaks one of his biggest campaign promises to voters: that he would leave Medicaid, Social Security, and Medicare untouched.
“I’m not going to cut Social Security like every other Republican and I’m not going to cut Medicare or Medicaid,” Trump told the Daily Signal, a conservative publication affiliated with the Heritage Foundation, in 2015.
Over the next 10 years, Trump’s 2020 budget proposal aims to spend $1.5 trillion less on Medicaid — instead allocating $1.2 trillion in a block-grant program to states — $25 billion less on Social Security, and $845 billion less on Medicare (some of that is reclassified to a different department).
https://www.vox.com/policy-and-politics/2019/3/12/18260271/trump-medicaid-social-security-medicare-budget-cuts