Walgreens Boots Alliance has set in motion a mechanism that will result in the Federal Trade Commission having 60 days to either clear its $9.7 billion acquisition of Rite Aid or sue to block it.

Walgreens and Rite Aid Corp. announced late Monday afternoon that they have “certified substantial compliance” with the second request from the FTC regarding their proposed merger.

“We are pleased to have certified completion of our submission of documents and information to the FTC in connection…