A NY1 reporter set off a battle of the ‘staches on Twitter between the city's incoming Police Commissioner and Tom Selleck.

It all started when NY1’s Dean Meminger tweeted an old photo of O'Neill side-by-side with CBS' Blue Bloods character Frank Reagan, played by Tom Selleck, highlighting the resemblance.

The Chief of Department then got in on the fun, reposting the picture.  

A number of news outlets picked up the exchange, also pointing out the resemblance.