Trump railed against Senator John McCain for being the deciding vote against the repeal of the Affordable Care Act, also known as Obamacare. Even after McCain’s death, Trump called his behavior “disgraceful,” among other remarks:

We needed 60 votes, and we had 51 votes. And sometimes, you know, we had a little hard time with a couple of them, right? Fortunately, they’re gone now. They’ve gone on to greener pastures—or perhaps far less green pastures. But they’re gone. They’re gone, Bill. I’m very happy they’re gone.

Trump and McCain had a long and mutual animosity. Trump infamously said he didn’t consider the former Vietnam pilot and Viet Cong prisoner a war hero because he was captured.

After the failure to repeal Obamacare without any Republican alternative, Trump remarked that “nobody knew that healthcare could be so complicated.” He later claimed that he “saved Pre-Existing Conditions,” even though that was a landmark provision of the legislation that he sought to repeal.

The Hill – Trump attacks John McCain over Obamacare repeal
USA Today – President Donald Trump on the late Sen. John McCain: ‘He did the nation a tremendous disservice’
The New York Times – Trump Again Attacks a Dead Senator: ‘I Never Will Be’ a Fan of John McCain