WATCH: 'Only guilty people try to hide the evidence,' Rep. Nadler says | Trump impeachment trial

As the first day of the impeachment trial continued past midnight, Judiciary Committee Chairman Jerry Nadler, D-N.Y., argued in favor of an amendment to subpoena former national security adviser John Bolton for testimony. Nadler said Bolton’s comments in documents collected by the House “makes clear” that the official was extremely concerned about and objected to President Donald Trump's pressure on Ukraine to investigate his political rivals. Nadler made a broader plea to the senators to support "an honest trial," and permit witnesses to testify. "Why is the president so intent on concealing the evidence and blocking all documents and testimony here today? Only guilty people try to hide the evidence," he said. Trump was impeached by the House of Representatives in December on two articles — abuse of power and obstruction of Congress. The Senate will now decide whether to convict Trump of those charges and remove him from office, or acquit him.

For more on who’s who in the Trump impeachment inquiry, read:

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