(CNN) Senate Majority Leader Harry Reid formally introduced a much-anticipated gun bill Thursday, his office announced. The Senate is expected to debate the legislation when the upper chamber returns from a two-week recess.

The bill, released just over three months after the elementary school massacre in Newtown, Connecticut, is made up of three measures. One measure expands the background check system, while the other two deal with school safety and gun trafficking.

“The bill I advance tonight will serve as the basis for opening debate,” Reid, the Senate’s leading Democrat, said in a statement.

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