Buckle up: What to watch as impeachment trial takes off

FILE - In this Sept. 25, 2019, file photo, President Donald Trump meets with Ukrainian President Volodymyr Zelenskiy at the InterContinental Barclay New York hotel during the United Nations General Assembly, in New York. It’s the story of a president who either had a “perfect phone call” with Ukraine or abused his power and should be removed from office. What to watch as presidential impeachment arguments get underway in the Senate for only the third time in American history. (AP Photo/Evan Vucci, File)
FILE - In this Jan. 15, 2020, file photo, Clerk of the House Cheryl Johnson carries the articles of impeachment against President Donald Trump to the Senate on Capitol Hill in Washington. It’s the story of a president who either had a “perfect phone call” with Ukraine or abused his power and should be removed from office. What to watch as presidential impeachment arguments get underway in the Senate for only the third time in American history. (AP Photo/J. Scott Applewhite, File)

WASHINGTON — Senators like to float above messy politics in what’s known by some as the dignified “upper chamber,” home of Congress’ cooler heads and lofty rhetoric.