Trump: 'Little' Michael Bloomberg was 'disaster' as NYC mayor
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Donald TrumpDonald John TrumpHow to stand out in the crowd: Kirsten Gillibrand needs to find her niche Countdown clock is on for Mueller conclusions Omar: White supremacist attacks are rising because Trump publicly says 'Islam hates us' MORE is no longer a fan of former New York City Mayor Michael Bloomberg, mocking him as "little" and calling his last term a "disaster."

Trump had previously praised Bloomberg but in a tweet Friday said he lacked courage and couldn't be elected to lead the Big Apple again today.

Trump's reversal came after Bloomberg, a Republican, delivered a blistering speech at Wednesday's Democratic National Convention, blasting the GOP presidential nominee.

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Trump had heaped praise on Bloomberg when he was mayor.

"Mike Bloomberg is doing a great job as Mayor of New York City," Trump had tweeted in April 2012.

He also lauded Bloomberg's 2013 initiative to pass stronger gun control legislation and for putting "his money where his mouth is" on "Fox and Friends" in 2013.

"Credit the Bloomberg administration for having the foresight and courage to get this decades long project finished — will be BIG for NY," Trump also tweeted in September of that year.

Bloomberg, who has endorsed Democrat Hillary ClintonHillary Diane Rodham ClintonHow to stand out in the crowd: Kirsten Gillibrand needs to find her niche Ex-Clinton aide: Dems should make 2020 'about integrity' Trump mounts Rust Belt defense MORE for president, called Trump a "dangerous demagogue" in his speech to the Democratic convention. 

"There are times when I disagree with Hillary Clinton. But let me tell you, whatever our disagreements may be, I've come here to say: We must put them aside for the good of our country. And we must unite around the candidate who can defeat a dangerous demagogue," said Bloomberg.