This time, he wants to go after their bottom line.

Emanuel is pushing two major financial institutions to stop their financial backing of gun makers, unless those companies support “commonsense reforms, including requiring criminal background checks on all gun sales.”

The mayor is urging that banks to stop lines of credit, financing for acquisitions and expansions and financial advising.

In a letter sent Friday to the CEOs of Bank Of America and TD Bank, Emanuel said: “In the past, the gun industry has stood in opposition to these safety measures.”