McConnell still hasn't ruled out the possibility of voting to convict Trump

• Senate Minority Leader Mitch McConnell hasn't announced his final impeachment vote.
• The top Republican still hasn't ruled out the option to convict Trump, per Bloomberg.
• McConnell was previously said to have told colleagues the trial would be a "vote of conscience."

Senate Minority Leader Mitch McConnell still hasn't ruled out the possibility of voting to convict Donald Trump in the former president's second impeachment trial.

The highest-ranking Republican in the Senate is undecided on the way he'll vote, sources familiar with his thinking told Bloomberg on Tuesday night after the first day of the trial.

The update was notable given that McConnell was among 44 GOP senators who on Tuesday voted to declare the impeachment trial unconstitutional, backing Trump's defense.

The Kentucky Republican was said to have reiterated to colleagues that their ultimate vote would be a "vote of conscience," as Insider reported he'd said last month.

Day two of Trump's impeachment trial is scheduled to begin Wednesday at noon ET. All 50 Democratic senators and 17 Republicans would need to vote "yes" to convict the former president of his charge of "incitement of insurrection."

A "yes" vote from McConnell would be a major development and could create a domino effect with other Republicans senators. Six GOP senators - Mitt Romney of Utah, Ben Sasse of Nebraska, Lisa Murkowski of Alaska, Susan Collins of Maine, Pat Toomey of Pennsylvania, and Bill Cassidy of Louisiana - broke from their party Tuesday and joined Democrats in declaring the impeachment trial constitutional, allowing it to proceed.

McConnell's posture differs from that during Trump's prior impeachment trial. At the time, the senator said that he would not be an "impartial juror" and that there would be "zero chance" of convicting Trump, who then was accused of abuse of power and obstruction of Congress over his dealings with Ukraine.

McConnell has expressed public frustration with Trump over his actions in connection to the deadly Capitol siege. Last month, he blamed Trump for the violent scene and said the mob that stormed the Capitol was "provoked by the president and other powerful people."