"It's long past time for the Iranian regime to provide us with information," she said.
Clinton told supporters Trump's "meltdown" proves he's unfit to be president.
Donald Trump is set to address supporters in Novi, Mich., at 5 p.m.
The paper backed Clinton after its rival, the Chicago Tribune, endorsed Gary Johnson.
Her lead drops by 1 point in a four-way contest.
Trump claimed that his microphone was defective.
"The very bottom line? Trump is not qualified. Hillary is fully qualified," the paper said.
Trump was deposed in June as part of a lawsuit involving his new D.C. hotel.
"I believe one of the jobs of the president is to encourage more service."
"It’s a deep sense of the country being taken away and betrayed," said Matthews.