Donald Trump was vigorously tweeting the morning after Democrats finished their presidential nominating convention.

His targets? A few choice people who criticized him from the stage at the Democratic National Convention.

The Republican presidential nominee on Friday referred to former New York mayor Michael Bloomberg, also a billionaire, as "Little Michael Bloomberg," who "never had the guts to run for president" and whose final term as mayor was "a disaster."

"Little" Michael Bloomberg, who never had the guts to run for president, knows nothing about me. His last term as Mayor was a disaster! — Donald J. Trump (@realDonaldTrump) July 29, 2016

That's a reversal from 2012, when Trump praised Bloomberg for reducing crime in New York City, declaring, "That's leadership."

Trump also attacked retired General John Allen, saying he "failed badly in his fight against ISIS." The former deputy commander of the wars in the Middle East had called Hillary Clinton the kind of "commander in chief America needs."

General John Allen, who I never met but spoke against me last night, failed badly in his fight against ISIS. His record = BAD #NeverHillary — Donald J. Trump (@realDonaldTrump) July 29, 2016

As for Clinton's claim that Trump can't handle a political campaign, he noted that he defeated a field of Republican hopefuls to win the GOP nomination.

Trump's campaign on Friday called Clinton's acceptance speech "an insulting collection of cliches and recycled rhetoric."

The statement issued Friday on Trump's campaign Facebook page says Clinton's stance on immigration "will take jobs, resources and benefits from the most vulnerable citizens of the United States and give them to the citizens of other countries."

In her remarks at the DNC on July 28,2016, Hillary Clinton called her opponent Donald Trump “a man you can bait with a tweet” and “not a man we can trust with nuclear weapons.”

Trump tweeted a link to the statement. It slammed Clinton for not mentioning the words, "radical Islam," ''her disaster in Libya" or the investigation of Clinton's private email server.

The statement said Clinton's remarks were "delivered from a fantasy universe, not the reality we live in today."

Clinton said Trump is offering America "empty promises" and what she called "bigotry and bombast."