WASHINGTON (AP) — So much for the Senate's quaint rules and tradition.

Almost immediately after Chief Justice John Roberts gaveled in Wednesday's session of President Donald Trump's impeachment trial, bored and weary senators started openly flouting some basic guidelines in a chamber that prizes decorum.

A Democrat in the back row leaned on his right arm, covered his eyes and stayed that way for nearly a half-hour. Some openly snickered when lead prosecutor Adam Schiff said he'd only speak for 10 minutes. And when one of the freshman House prosecutors stood to speak, many of the senator-jurors...