What is the alleged quid pro quo in Mayor Eric Adams' corruption case?

The alleged quid pro quo involves Mayor Eric Adams' team reportedly offering to 'play ball' with the Trump administration on immigration enforcement in New York City in exchange for federal corruption charges against him being dismissed. This arrangement was noted by a deputy attorney general in a footnote of a memo to Attorney General Pam Bondi after a meeting between Adams' lawyers and DOJ officials. The official perceived this as an unjust arrangement where the mayor's team was essentially offering cooperation on immigration policies if the charges would go away, despite Adams repeatedly denying such claims.