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Jimmy Kimmel ain't holding back after 'Live!' was reinstated on ABC ... taking to Instagram to mock President Donald Trump 's escalator mishap at the United Nations General Assembly this week. Instagram / @jimmykimmellive

Check out Jimmy's post on his show's official Instagram Friday -- he shared a photo of his longtime sidekick Guillermo Rodriguez smiling down at him on an escalator and captioned it ... "Headed to Brooklyn! Escalator is working great!"

As you know, the prez was PO'd after he and First Lady Melania Trump stepped onto the escalator ahead of the general assembly Tuesday and it suddenly halted, jerking them forward. Play video content

Luckily, the pair stayed on their feet and only looked minimally agitated ..

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