"We're at an impasse," McConnell said in response.

Along partisan lines, Americans' views on impeachment are neatly split. An NBC News/Wall Street Journal poll released on the impeachment day found 48 percent of registered U.S. voters believe Trump should be impeached and removed from office, while an equal 48 percent say they disagree.

Moreover, both Democrats and Republicans show no willingness to move closer to each other on the impeachment. The poll showed some 90 percent of Republicans oppose impeaching Trump and removing him from office, while 83 percent of Democrats favor it. Among independents, 50 percent support impeachment and removal, while 44 percent oppose it.

"Views on Donald Trump's impeachment remain locked in place, with most Americans having made up their mind both on Trump and the impeachment investigation a long time ago," said Democratic pollster Jeff Horwitt of Hart Research.

The Democratic Party has won the first phase of impeachment battle in the lower chamber, but failed to make the case transcend the turning-white-hot partisan struggle, many local analysts observe.

Senate Republicans may follow suit by acquitting Trump in a quick wrap-up of the trial as McConnell has suggested, with little hope and efforts to sway opposite views.

"This is a political process. There's not anything judicial about it," the Senate majority leader said, calling himself "not an impartial juror."

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