Michelle Obama says presidential candidates don't change if they win and "we need an adult in the White House."
The first lady attacked Donald Trump at a rally in Philadelphia on Wednesday, saying that if a candidate thinks not paying taxes makes him smart, or makes cruel and insulting comments about women, that's who the candidate really is.
She said "experience, preparation and temperament matters and Hillary Clinton has it all."
The Trump campaign says Clinton is "in panic mode" in Pennsylvania because of his improved polling and what they say is her disconnect with millennials and African-American voters.
Michelle Obama also denounced Trump's role in the birther movement.
The first lady said questions about her husband's citizenship can't be swept under the rug "by an insincere sentence uttered at a press conference."
She didn't mention Trump by name, but that was clearly a reference to the Republican nominee's brief statement this month finally acknowledging that President Obama was born in the United States.
Mrs. Obama said the birther movement raised "hurtful, deceitful questions" aimed at undermining her husband's presidency.
She said the president has answered those questions "by going high when they go low."
The first lady said the next president "just can't pop off or lash out irrationally."
Mrs. Obama was campaigning at LaSalle University in Philadelphia. The first lady was heading to Pittsburgh for another rally later Wednesday.
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