Trump targets Biden's mental health in debate lead-up, despite aides' efforts to raise expectations
By Will Steakin, Katherine Faulders & John Santucci
'Plan for the Worst and Hope for the Best.' Why Law Enforcement Officials Are Worried About Post-Election Violence
By W.J. Hennigan
Trump's escalating attacks on election prompt fears of a constitutional crisis
By Amy Gardner, Annie Linskey & Philip Rucker