Bernie Sanders is challenging Hillary Clinton's popularity in California, the new USC Dornsife/Times poll finds.

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Paul Ryan aide: Trump endorsement wasn't planned to coincide with Clinton speech

House Speaker Paul Ryan publicly endorsed Donald Trump as Hillary Clinton delivered a scathing speech warning of the dangers of a Trump presidency Thursday in San Diego.

But the timing was just a coincidence, according to one of Ryan's chief staffers.

The endorsement came one month after Ryan told CNN he was " just not ready" to throw his support behind Trump.

Despite the clarification from Ryan's camp, some questioned the timing of the announcement.

Ryan's endorsement referred to conversations he and Trump had about potential Supreme Court nominees and ways for the House to push forward policies.

"Through these conversations, I feel confident he would help us turn the ideas in this agenda into laws to help improve people’s lives" Ryan said in an op-ed published in his hometown newspaper, the Janesville Gazette. "That’s why I’ll be voting for him this fall."

Ryan's initial reluctance to support Trump was billed as an attempt to push their candidate to unify the GOP.

A meeting between Ryan and Trump last month seemed to soften tensions, with Ryan saying he was "very encouraged" after that conversation.

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