OSAGE, Iowa — Joe Biden said definitively on Wednesday that he would not participate in any witness swap as part of the Senate impeachment trial.

His remarks came as other top Senate Democrats attempted to tamp down any notion that they would agree to call Biden or his son Hunter in return for appearances by top Trump administration officials.

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Biden’s remarks, his most forceful attempt to signal that he wants no part of the impeachment trial in which Republicans are trying to embroil him, came after a voter here asked if he would offer to testify in return for testimony from people such as former national security adviser John Bolton or acting chief of staff Mick Mulvaney.

The former vice president said it was “not an irrational question to ask” but said that he would not engage in such a trade.

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