A pair of Trump supporters quickly ruined the work of residents in a Bay Area town that got the OK to paint a Black Lives Matter mural — and now, cops would like a word.

This went down Saturday in the city of Martinez, CA — where a large mural reading “BLM” was stenciled and filled in with paint by the people there in front of their local courthouse — something city officials approved and even advertised as a community-led holiday event.

The painting of the mural was scheduled from 9 AM to 3 PM, but not too long after folks there finished up the job … these two boneheads rolled up and did a paint job of their own.

The woman here — who appeared to be rocking a MAGA-themed shirt — started applying black paint over the letters with a roller … she began with the B and then moved on to the L in a sloppy rush — as people around them started to film and get in their face about it.

She had a man with her who was definitely wearing Trump 2020 gear — and he was standing by and filming the encounter himself, getting into shouting matches with bystanders and telling them they were brainwashed, and that racism was a liberal hoax. Seriously …

The witnesses got footage of their truck as well as their license plate. Eventually, the couple scrammed before they could finish their defacement … things were getting heated.

Now, Martinez Police says they’re looking for these two and plan to arrest them for defacing the mural … which, again, was a city-sanctioned thing. Sounds like they might be facing a simple vandalism charge — the cops were hesitant to call this a hate crime quite yet.

And, of course, Twitter was quick to label them the newest “Karen” and “Kevin” — but we’ll just resort to calling them Tweedle Dee and Tweedle Dumbass. Probably more accurate.