Thompson took a dig at his future GOP rival Tuesday.
WASHINGTON (CNN) – He's not even an official presidential candidate yet, but former Tennessee Sen. Fred Thompson took a not-so-subtle dig at White House frontrunner Rudy Giuliani Tuesday, slamming New York City's gun laws on his Web site.
The former "Law & Order" star criticized how the city Giuliani once led tries to "force its ways on the rest of us," and railed against "the same activist judge from Brooklyn who provided Mayor Giuliani with the legal ruling it sought to sue gun makers" for allowing the city to "sue out of state gun stores."
Thompson went on to argue an increase in gun ownership rates leads to a decrease in crime, and reinforced his pledge to appoint conservative judges to the courts "who apply the law as written."
Katie Levinson, a spokeswoman for the former New York City mayor's campaign, was quick to respond to Thompson's charges saying, "Those who live in New York in the real world – not on TV – know that Rudy Giuliani's record of making the city safe for families speaks for itself. No amount of political theater will change that."
Thompson's comments were his most pointed jab yet at a potential GOP rival and the latest sign he is an all-but-declared presidential candidate. Officially though, Thompson is only "testing the waters" - a legal distinction with the Federal Election Commission that prevents him from actively campaigning for the presidential nomination. The former actor is expected to jump into the race early next month. (Related: FEC complaint filed against Thompson)
Giuliani, who leads in most national presidential polls, is also the target of rival Mitt Romney's new radio ad, in which the former Massachusetts governor slams cities with what he calls "sanctuary" for illegal immigrants specifically "Newark, San Francisco and New York City."
TIME.com: Fred Thompson and Iowa's Great Bull
– CNN Ticker Producer Alexander Mooney