CHICAGO — Former President Donald Trump’s former attorney Michael Cohen showed up at the Democratic National Convention in Chicago to tell Americans his former boss is a threat to America.

He said he feared for the future if Mr. Trump returned to the White House.

“I fear for my children. I fear, God willing one day, my grandchildren if I’m lucky enough to live that long,” he told The Washington Times. “I’m concerned about our democratic republic when you have somebody who wants to be president of the United States making statements like, ‘I want to rewrite the Constitution.’ Do you really think this dumbass could rewrite the Constitution?”

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“When he says that he wants to destroy our tripartite system of government and confer all power to himself — what do you think is going to end up happening in this country? Because the answer is going to be the end of our democratic republic,” he said.

Mr. Cohen, who worked as Mr. Trump’s fixer for more than a decade testified against the former president during his May trial in which Mr. Trump was convicted on 34 felony counts of falsifying business records to conceal hush money payments in 2016.

Mr. Trump has called Mr. Cohen a “disgraced lawyer” and serial liar.

Mr. Cohen — who pleaded guilty to campaign finance violations, tax fraud, bank fraud and lying to two congressional committees —was disbarred from practicing law in New York.

As he mingled at the DNC, Mr. Cohen told The Times that he was invited to the convention as a guest of a couple of Congress members. He declined to say who invited him.

Mr. Cohen said that he was a lifelong Democrat and strong supporter of Vice President Kamala Harris and her running mate, Minnesota Gov. Tim Walz.