Consultant Hakeem Jeffries, the second-highest-ranking Black lawmaker in Congress, has launched an aggressive effort to discredit a proposed congressional map that might divide traditionally Black neighborhoods in New York, likening its configurations to Jim Crow ways.

Mr. Jeffries is spending tens of hundreds of {dollars} on digital advertising as a part of a scorched-earth marketing campaign to attempt to cease New York’s courts from making the brand new map last with out adjustments later this week.

As construed, the map would cut up Bedford-Stuyvesant in central Brooklyn into two districts and Co-Op Metropolis within the Bronx into three, for instance, whereas putting Black incumbents in the identical districts — adjustments that Mr. Jeffries argues violate the State Structure.

“We discover ourselves in an all-hands-on-deck second,” Mr. Jeffries, a Brooklyn Democrat, mentioned in an interview on Thursday. In the latest advert, he says the adjustments took “a sledgehammer to Black districts. It’s sufficient to make Jim Crow blush.”

Mr. Jeffries could also be laying the groundwork for an eventual authorized problem, however his extra speedy goal was to stress Jonathan R. Cervas, New York’s court-appointed particular grasp, to alter congressional and State Senate maps that he first proposed on Monday earlier than he presents last plans to a state court docket choose for approval on Friday.

The stakes might scarcely be greater. After New York’s highest court docket struck down Democrat-friendly maps drawn by the State Legislature as unconstitutional final month, the judges have vested close to complete energy in Mr. Cervas, a postdoctoral fellow from Carnegie Mellon, to put traces that can govern elections for a decade to come back.

Mr. Cervas’s preliminary proposal unwound a map gerrymandered by the Democratic-led State Legislature, creating new pickup alternatives for Republicans. Nevertheless it additionally considerably altered the shapes of districts in New York Metropolis — rigorously drawn a decade earlier by one other court docket — that mirrored a patchwork of racial, geographic and financial divides.

Mr. Jeffries was removed from alone in lodging last-ditch appeals. The court docket was inundated with lots of of feedback suggesting revisions from Democrats and Republicans alike — from celebration attorneys urgent for extra politically favorable traces to an analysis of the variations between Jewish households on the East and West Sides of Manhattan.

A broad coalition of public curiosity and minority advocacy teams informed Mr. Cervas this week that his adjustments would threat diluting the ability of traditionally marginalized communities. They included Common Cause New York and the United Map Coalition, an influential group of Latino, Black and Asian American authorized teams.

The proposed map would divide Bedford-Stuyvesant, Crown Heights and Brownsville — culturally vital Black communities in Brooklyn — between the eighth and ninth Congressional Districts. Every neighborhood at present falls in a single or the opposite.

The northeast Bronx, one other predominantly Black space that features Co-Op Metropolis and falls inside Consultant Jamaal Bowman’s district, could be cut up amongst three totally different districts.

The teams have raised related issues about Mr. Cervas’s proposal to separate Manhattan’s Chinatown and Sundown Park, residence to giant Asian American populations, into two districts for the primary time in a long time. Different Jewish groups have made related appeals for his or her group in Brooklyn.

Many of the adjustments are prone to have little affect on the partisan make-up of the districts, that are safely Democratic. However Lurie Daniel Favors, the manager director of the Middle for Legislation and Social Justice at Medgar Evers School, mentioned that reducing by current communities would additional dilute the political energy of traditionally marginalized teams.

“Now, when Bedford-Stuyvesant desires to arrange and petition on the congressional stage, they’ve to separate their efforts and go to 2 separate representatives,” she mentioned.

The maps would additionally push 4 of the state’s seven Black representatives into two districts, forcing them to compete with each other or run in a district the place they don’t dwell. Underneath the particular grasp’s plan, Mr. Jeffries and Consultant Yvette Clark would dwell in the identical central Brooklyn district, and Mr. Bowman and Mondaire Jones would reside in the identical Westchester County seat.

“It’s one other slap within the face for Black individuals,” mentioned Mr. Bowman, whose district would see its Black voting-age inhabitants fall from about 30 p.c to 21 p.c below the brand new maps.

Mr. Cervas has not defined why he drew the traces as he did. He declined to touch upon the maps on Thursday, however mentioned that his staff was “reviewing each single remark that has been submitted to the court docket.”

Language amended to the New York Structure in 2014 presents mapmakers with a set of competing directives. It says districts can’t be drawn to discourage competitors or favor a specific candidate or celebration. It additionally instructs line drawers to “take into account the upkeep of cores of current districts” and “communities of curiosity.”

Democrats like Mr. Jeffries pointed to these directives on Thursday, arguing that in a drive to spice up the competitiveness of seats throughout the state, Mr. Cervas had chopped up the cores of some current districts or communities of curiosity. Public curiosity and civil rights teams have been exploring the opportunity of legally difficult the maps if the ultimate variations didn’t tackle their issues.

“We’re ready to do all the pieces obligatory below the legislation to proper the unsuitable that has been visited upon communities of colour,” Mr. Jeffries mentioned.

However authorized consultants mentioned it may very well be tough to persuade a choose given the Structure’s conflicting necessities.

“What they’re arguing for is an affordable final result, however I don’t know that the place the particular grasp is is just not additionally an affordable selection,” mentioned Michael Li, senior counsel for the Democracy Program on the Brennan Middle for Justice.

“I’m unsure anybody thus far has said clear-cut authorized grounds” to show in any other case, he added.

Republicans who challenged the Democratic congressional maps largely opposed the adjustments in Brooklyn and the Bronx in their own letter to the court docket late Thursday. They’ve complained that Mr. Cervas didn’t go far sufficient in unwinding Democrats’ tried gerrymander, arguing that he produced a congressional map that also tilts too far left.

In the meantime, new authorized instances proceed to spin off from New York’s redistricting saga.

The League of Ladies Voters of New York State filed a lawsuit in federal court docket in Manhattan late Wednesday looking for to delay the June 28 primaries for governor and different statewide places of work and reopen the petitioning course of primarily based on the newly drawn congressional districts. Doing so would enable new candidates the possibility to hitch the Democratic and Republican major fields, and a plaintiff within the swimsuit particularly mentions one chance: former Gov. Andrew M. Cuomo.