Struggling Biden faces big test with ABC interview, vows to fight on

President Joe Biden, scrambling to defuse a political crisis over his shaky debate performance, will participate in a television interview on Friday that will be closely watched for signs of whether his mental acuity is failing.

Biden will travel to Madison, Wisconsin, to rally Democratic voters. During the trip he will be interviewed by ABC News, part of a flurry of events over the next week aimed at showing Americans he still has the stamina to run against Republican candidate Donald Trump in the Nov. 5 election.

While Biden insists he is staying...