In this Feb. 5, 2019, file photo, President Donald Trump delivers his State of the Union address to a joint session of Congress on Capitol Hill in Washington, as Vice President Mike Pence and Speaker of the House Nancy Pelosi, D-Calif., watch. (AP Photo / Andrew Harnik, File)

President Donald Trump’s impeachment trial heads toward a historic conclusion this week, with senators all-but-certain to acquit him on charges of abuse of power and obstruction of Congress after narrowly rejecting Democratic demands to summon witnesses.

In this image from video, Senators cast their vote on the motion to allow additional witnesses and evidence to be allowed in the impeachment trial against President Donald Trump in the Senate at the U.S. Capitol in Washington, Friday, Jan. 31, 2020. The motion failed with a vote of 51-49. (Senate Television via AP)

The Senate rejected the idea of summoning witnesses for President Donald Trump’s impeachment trial late Friday, all but ensuring his acquittal. But senators considered pushing off final voting on his fate to next week.

Sen. Lamar Alexander, R-Tenn., arrives on Capitol Hill in Washington, Thursday, Jan. 30, 2020, before the impeachment trial of President Donald Trump on charges of abuse of power and obstruction of Congress. (AP Photo/ Jacquelyn Martin)

Republican Sen. Lamar Alexander of Tennessee will oppose calling more witnesses in President Donald Trump’s impeachment trial, all but dashing Democratic efforts to hear more testimony and pushing the Senate toward a vote to acquit Trump as soon as Friday.

In this image from video, Alan Dershowitz, an attorney for President Donald Trump, answers a question during the impeachment trial against Trump in the Senate at the U.S. Capitol in Washington, Wednesday, Jan. 29, 2020. (Senate Television via AP)

In a striking shift from President Donald Trump’s claim of “perfect” dealings with Ukraine, his defense asserted at his Senate trial that a trade of U.S. military aid for political favors — even if proven — could not be grounds for his impeachment.

Jay Sekulow, personal attorney to President Donald Trump, speaks during the impeachment trial against Trump in the Senate on Tuesday, Jan. 28, 2020. (WTTW News via CNN)

The president’s legal team has wrapped up its impeachment defense. What’s next? And what to make of the trial so far? We ask law professor and former Supreme Court clerk Carolyn Shapiro and journalist Chris Bury.

Ken Starr, an attorney for President Donald Trump, speaks during the impeachment trial of Trump on Monday, Jan. 27, 2020. (WTTW News via CNN)

The president’s lawyers on Monday resumed their impeachment defense that began on Saturday – but there was an elephant in the room.

House Democratic impeachment manager, House Intelligence Committee Chairman Adam Schiff, D-Calif., arrives at the Senate as work resumes in the impeachment trial of President Donald Trump on charges of abuse of power and obstruction of Congress, at the Capitol in Washington, Saturday, Jan. 25, 2020. (AP Photo / J. Scott Applewhite)

President Donald Trump’s impeachment trial enters a pivotal week as his defense team resumes its case and senators face a critical vote on whether to hear witnesses or proceed directly to a vote.

House Democratic impeachment managers, from left, House Intelligence Committee Chairman Adam Schiff, D-Calif., Rep. Jason Crow, D-Colo., Rep. Zoe Lofgren, D-Calif., and House Judiciary Committee Chairman Jerrold Nadler, D-N.Y., arrive for the start of the third day of the impeachment trial of President Donald Trump at the Capitol in Washington, Thursday, Jan. 23, 2020. (AP Photo / J. Scott Applewhite)

It’s day two of opening arguments in the impeachment trial of President Donald Trump, and House managers are laying out their case for abuse of power. A former Supreme Court clerk offers his take on the proceedings so far.

In this image from video, presiding officer Supreme Court Chief Justice John Roberts speaks during the impeachment trial against President Donald Trump in the Senate at the U.S. Capitol in Washington, Wednesday, Jan. 22, 2020. (Senate Television via AP)

Americans are sharply divided along party lines about whether President Donald Trump should be removed from office, and they doubt the Senate impeachment trial will do anything to change their minds, according to a new poll.

The U.S. flag flies over the U.S. Capitol in Washington on Sunday, Jan. 19, 2020. (AP Photo / Manuel Balce Ceneta)

A look at the main points Democrats are making as they argue for President Donald Trump’s removal from office, and Trump’s response as the defense team pushes for his speedy acquittal.

Senate Majority Leader Mitch McConnell, R-Ky., arrives at the Senate for the start of the impeachment trial of President Donald Trump on charges of abuse of power and obstruction of Congress, at the Capitol in Washington, Tuesday, Jan. 21, 2020. (AP Photo / J. Scott Applewhite)

President Donald Trump’s impeachment trial quickly burst into a partisan fight Tuesday at the Capitol as Democrats objected strongly to rules proposed by the Republican leader for compressed arguments and a speedy trial.

American flags blow in wind around the Washington Monument with the U.S. Capitol in the background at sunrise on Monday, Jan. 20, 2020, in Washington. The impeachment trial of President Donald Trump will resume in the U.S. Senate on Jan. 21.  (AP Photo / Jon Elswick)

Senate Majority Leader Mitch McConnell on Monday proposed a condensed, two-day calendar for each side to give opening arguments in President Donald Trump’s impeachment trial, ground rules that are raising objections from Democrats.

In this Feb. 22, 2018 file photo, Florida Attorney General Pam Bondi speaks to reporters outside the West Wing in Washington. (AP Photo / J. Scott Applewhite)

President Donald Trump’s legal team for his Senate impeachment trial will include a pair of well-known attorneys who have vigorously defended Trump on television and played roles in some of the most consequential legal dramas in recent history.

In this Dec. 2, 2019, file photo, Lev Parnas arrives at court in New York. Parnas, a close associate of President Donald Trump’s personal lawyer, Rudy Giuliani, has provided a trove of text messages and photos to the House committee leading the impeachment inquiry. (AP Photo / Seth Wenig, File)

A close associate of President Donald Trump’s personal lawyer Rudy Giuliani is claiming Trump was directly involved in the effort to pressure Ukraine to investigate Democratic rival Joe Biden.

Clerk of the House Cheryl Johnson carries the articles of impeachment against President Donald Trump to the Senate, on Capitol Hill in Washington, Wednesday, Jan. 15, 2020. (AP Photo / J. Scott Applewhite)

The impeachment of President Donald Trump is the Senate’s challenge now. Look Thursday for a series of striking ceremonial matters to set up the Senate as a court of impeachment. 

House Speaker Nancy Pelosi announces the impeachment managers in Washington, D.C., on Wednesday, Jan. 15, 2020. (WTTW News via CNN)

After nearly a month of delay, the House of Representatives voted Wednesday to transmit articles of impeachment for the trial of President Donald Trump to the Senate. We discuss the latest and look ahead.