WASHINGTON (AP) — 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.

The Capitol Hill maneuvering will be complemented by high-stakes efforts on both sides of the aisle to claim political advantage from the proceedings as the presidential nominating season kicks off in Iowa on Feb. 3.

What to watch as the Senate imp...