US travelers will soon need visa for Europe; Trump vows to end requirement if elected

US citizens will need to apply and pay for authorization starting in 2024 to travel to Europe.
Application involves submitting personal details and takes about 10 minutes to be approved.
Authorization costs $8, lasts 3 years, and is linked to passport.
Trump has vowed to eliminate the requirement if elected, but has not provided specifics.
Requirement applies to visa-exempt travelers for stays up to 90 days in any 180-day period.