Sen. Mitt Romney (R-UT) will not seek a second term next year, he announced on Wednesday.

Romney, 76, said in an interview that his decision not to run again was heavily influenced by his age and his prediction that his second term in the Senate would be less effective than his first.

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“It’s very difficult for the House to operate, from what I can tell,” Romney said. “And perhaps more importantly, we’re probably going to have either Trump or Biden as our next president. And Biden is unable to lead on important matters, and Trump is unwilling to lead on important matters.”

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