"I made it clear that I see myself as a bridge to the next generation of leaders," the California Democrat said.
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She also pointed to her husband, President Donald Trump, saying she "sometimes" doesn't "agree with his tone and I tell him that."
"It's a gridlock scenario," one expert said. "Even if Theresa May had lost, whoever replaced her would face the same problems."
Canada is holding Chinese telecommunications executive Meng Wanzhou, who is wanted by the United States.