Defense resumes in key impeachment week; Dems seek witnesses

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, Saturday, Jan. 25, 2020. (Senate Television via AP)

FILE - In this Dec. 2, 2019, file photo, attorney Alan Dershowitz talks to the press outside federal court, in New York. Retired law professor Alan Dershowitz says he hasn't changed at all and has a long history of representing people whose views he doesn't necessarily agree with. Dershowitz is part of President Donald Trump's defense team at the Senate impeachment trial. (AP Photo/Richard Drew, File)

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)

Sen. Lindsey Graham, R-S.C., with Sen. John Barrasso, R-Wyo., speaks to reporters on Capitol Hill in Washington, Saturday, Jan. 25, 2020, the impeachment trial of President Donald Trump on charges of abuse of power and obstruction of Congress concluded for the day. (AP Photo/Manuel Balce Ceneta)

President Donald Trump's personal attorney Jay Sekulow, center, stands with his son, Jordan Sekulow, left, and White House Counsel Pat Cipollone, while arriving at the Capitol in Washington during the impeachment trial of President Donald Trump on charges of abuse of power and obstruction of Congress, Saturday, Jan. 25, 2020. (AP Photo/Julio Cortez)

WASHINGTON — 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 that is widely expected to end in his acquittal. The articles of impeachment charge Trump with abuse of power and obstruction of Congress.