"Saturday I met with families of police officers. Among concerns expressed was 'doxing' of law enforcement officers' addresses and contact info, which means sharing personal information with malicious intent," he wrote.
The Missouri Democrat added: "I am introducing an ordinance today to criminalize such actions."
The legislation seeks to change the city code to make it a crime to divulge personal information with the intent to "intimidate, abuse, threaten, harass or frighten a public servant, a public servant's immediate family or a public servant's domestic partner."
The tweet said a person's name, Social Security number, date of birth, credit card number, employment location, home address and telephone number should be off-limits for those looking to expose personal information online or in the public sphere.
A public servant is defined as anyone elected to a position in the city, anyone employed by the Board of Police Commissioners, any person appointed to a position by the city and anyone who is employed by the city.
Lucas followed up with another tweet that championed free speech, while simultaneously decrying "intimidation" tactics against local police and politicians.
"Our officers and other public employees have a right to get home safely and their families should be safe from harm," he wrote. "We welcome free expression in Kansas City. We do not welcome intimidation of people doing the jobs we hire them to do or intimidation of their spouses and children."