(CNN) Three-quarters of registered voters think witnesses should be allowed to testify in the Senate impeachment trial, which has reached a crucial inflection point, a new national poll from Quinnipiac University finds.

This includes 49% of Republicans who think witnesses should be allowed to testify, 75% of independents and 95% of Democrats.

President Donald Trump's legal team ended their opening arguments Tuesday afternoon and the trial now moves on to a 16-hour period for senators to ask questions. Following that could be a vote on whether to bring witnesses, which has long been seen as a critical vote but has taken on new importance in the wake of news reports on former Trump national security adviser John Bolton's book.

The poll shows 20% of registered voters do not want witnesses called at the trial.

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