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WATCH: Trump trial opens as senators race toward vote

The Senate gaveled open as the court of impeachment is expecting to wrap up Donald Trump’s trial over the Capitol siege.

Watch the moment in the player above.

Senators were speeding toward an expected vote in the rare Saturday session on whether to convict or acquit the former president on the charge of incitement of insurrection in the Jan. 6 attack.

But that vote was postponed when senators voted to consider witnesses.

Closing arguments were expected Saturday with no witnesses called. But lead Democratic prosecutor Jamie Raskin of Maryland asked for a deposition of Rep. Jaime Herrera Beutler over fresh information.

She has widely shared a conversation she had with House Republican leader Kevin McCarthy over Trump’s actions on Jan. 6 as the mob was rioting over the presidential election results.

Raskin said it was necessary to determine Trump’s role in inciting the deadly Jan. 6 riot. There were 55 senators who voted to debate the motion to subpoena, including Republican Sen. Lindsey Graham, who changed his vote in the middle of the count.

Trump’s attorney Michael van der Veen balked at the request, saying he’d then call 100 witnesses and said it was not necessary.

Read more of NewsHour’s coverage:

  • The Second Impeachment of Donald Trump
  • Read Trump’s full response to House Democrats’ arguments for impeachment
  • Read Democrats’ full impeachment brief against Trump for second Senate trial
  • With Senate split 50-50, here’s what Democrats can and can’t do