Associated Press THIS PHOTO FROM October 2016 shows an aboveground section of Enbridge's Line 5 at the Mackinaw City pump station. (AP Photo/John Flesher) TRAVERSE CITY, Mich. (AP) — Months after President Joe Biden snubbed Canadian officials by canceling Keystone XL, an impending showdown over a second crude oil pipeline threatens to further strain ties between the two neighbors that were frayed during the Trump administration. Michigan Gov. Gretchen Whitmer, a top Biden ally, ordered Canadian energy company Enbridge last fall to shut down its Line 5 — a key piece of a crude delivery net...