WASHINGTON—Republican leaders said they don’t currently have enough votes to block witnesses in President Trump’s Senate impeachment trial, after his legal team concluded its efforts to counter Democrats’ charges that the president abused power and obstructed Congress.

On the third and final day of presentations by the Trump legal team, lawyers tried to cast doubts on the importance and credibility of allegations by former national security adviser John Bolton about the president’s motives for freezing aid to Ukraine.

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But at a meeting of all Republican senators late Tuesday, GOP leaders told their conference that they don’t currently have the votes to prevent witnesses from being called, people familiar with the matter said. Republicans had hoped to wrap up the trial with an acquittal of the president by this week, but Democrats have said he should appear under oath to offer a firsthand account of the president’s motivations for freezing aid to Ukraine—a matter at the heart of the impeachment case.

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