President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE hit Sen. John McCain John Sidney McCainAnalysis: Biden victory, Democratic sweep would bring biggest boost to economy The Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE in a speech hours after signing a defense bill named after the Arizona Republican.

Trump, speaking at a New York fundraising event, sarcastically referred to McCain as “one of our wonderful senators,” and referenced McCain’s key vote against a proposed repeal of the Affordable Care Act.

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“ObamaCare, we got rid of the individual mandate, which is the most unpopular aspect,” Trump said. “I would’ve gotten rid of everything, but as you know, one of our wonderful senators said ‘thumbs down’ at 2 o'clock in the morning.”

The comment prompted a small chorus of boos from the audience.

After refusing to say his name earlier today, Trump goats his audience into booing cancer-stricken John McCain for voting against ACA repeal pic.twitter.com/uDdnuyqPzO — Aaron Rupar (@atrupar) August 13, 2018

Trump earlier in the day did not mention McCain during his signing of the defense bill, a $717 billion piece of legislation that is officially titled the John S. McCain National Defense Authorization Act for Fiscal Year 2019.

The omission sparked backlash among frequent Trump critics, including former Secretary of State John Kerry John Forbes KerryThe Memo: Warning signs flash for Trump on debates Divided country, divided church TV ads favored Biden 2-1 in past month MORE, who called it “disgraceful.”

Trump has a history of mocking the senator, who has been undergoing treatment for brain cancer at his home in Arizona.