A Republican pol on Saturday abruptly dropped out of a hotly contested City Council race in southern Brooklyn — one day after his camp was accused of forging a signature on a petition needed to get on the primary ballot. 

Michael Ragusa, a former city EMT and one of four Republicans vying for the 47th District that includes Bay Ridge, claimed he did nothing wrong and believes he was set up. 

“Recent serious allegations have been made against me, which were quite shocking to our team as well, and have created an insurmountable barrier to continuing my campaign,” he told The Post. 

“Unfortunately I put my trust in a volunteer who took advantage and tried to sabotage my campaign,” he added. 

State Assemblyman Alec Brook-Krasny (R-Brooklyn) alleged on Friday his signature was forged by someone working for Ragusa, and asked Brooklyn District Attorney Eric Gonzalez to investigate.

Ragusa declined to say who he thinks might be behind signature-gate. 

The winner of the June 27 Republican primary faces Democratic incumbent Justin Brannan.