Analysis Summary:

The article is mostly accurate, reporting on Senate Democrats' call for witnesses in the impeachment trial following new revelations. The article exhibits a slight bias by framing the situation from the Democrats' perspective and including Trump's tweet without providing further context. The key claims are supported by the provided sources.

Detailed Analysis:

• Claim:** Senate Democrats say new revelations about President Trump withholding military aid from Ukraine are a turning point in his impeachment saga.
  • Verification Source #1: Supports this claim, stating Democrats pressured for Bolton to testify after a new report.
  • Verification Source #2: Supports this claim, mentioning Schumer's call for witnesses based on new reporting.
  • Verification Source #5: Supports this claim, mentioning the top Senate Democrat calling for new evidence and testimony.
• Claim:** The president tweeted that the Democrats want to avoid a trial to protect former Vice President Joe Biden.
• This claim is presented without context or verification. While it accurately reports the content of the tweet, it doesn't assess its validity.
• Verification Source #1, #2, #3, #4, and #5: *Fail to cover* this specific claim about the tweet's content.

Supporting Evidence/Contradictions:

• Verification Source #1: "Democrats pressure Senate To Call Bolton As A Witness Following ... impeachment trial following a new report that House impeachment managers describe as "explosive." The New York Times reported Sunday evening ..." This supports the claim that Democrats were pushing for witnesses after new information surfaced.
• Verification Source #2: "Senate Minority Leader Chuck Schumer renewed his call Monday for White House acting chief of staff Mick Mulvaney and former national security adviser John ..." This supports the claim that Democrats were calling for witnesses.
• Verification Source #3: "The U.S. Senate voted on Friday against calling witnesses and collecting new evidence in President Donald Trump's impeachment trial..." This provides context that the call for witnesses was ultimately unsuccessful.
• The article's inclusion of Trump's tweet without any counter-argument or context suggests a slight bias.