With cities across America in turmoil over the death of George Floyd, a US lawmaker plans to introduce legislation this week that he hopes will end a pattern of police violence by allowing victims to sue officers for illegal and unconstitutional acts.

US Representative Justin Amash (photo, above), a conservative independent from Michigan, won support from a Minneapolis Democrat on Monday for his “Ending Qualified Immunity Act,” which would allow civil lawsuits against police, a recourse that the Supreme Court has all but done away with...