HARTFORD, Conn. (AP) Connecticut lawmakers are expected to pass a package of gun control and other measures they believe are some of the most comprehensive in the country, following the Newtown school massacre.

Debate on the far-reaching legislation, negotiated by Democratic and Republican legislative leaders, is expected to begin late Wednesday morning.

It could last for hours. Both gun rights advocates and gun control supporters are expected to show up in large numbers.

Some measures in the bill would take effect immediately, including expansion of the state's assault weapons ban, background checks for all firearms sales, and a ban on the sale or purchase of ammunition magazines holding more than 10 rounds.

The text of the bill can be found on the state legislature's website.

Gov. Dannel P. Malloy says he'll sign the legislation into law. Family members of the shooting victims have voiced their support.

The mother of a child killed in the Dec. 14 school shooting says she's grateful and pleased with the gun control proposal that state lawmakers have unveiled.  Nicole Hockley and five other relatives of Newtown victims visited the Capitol on Monday, asking lawmakers to ban existing high-capacity ammunition magazines.

The proposal fell short of that but did include a ban on new high-capacity magazines and registration requirements for existing ones.

Hockley said lawmakers had listened to her and other victims' families by strengthening the provision on large capacity magazines.

Tim Mackris, co-founder of Sandy Hook Promise, called the bill ``a step in the right direction.''

President Barack Obama is planning a trip to Connecticut Monday to step up the pressure on a reluctant Congress to pass gun control legislation.

A White House official speaking on a condition of anonymity says the president will speak at the University of Hartford. Families of those killed at Sandy Hook Elementary School in Newtown, Conn., in December are being invited to attend.

It will be the president's second trip in a week to a state hit by a mass shooting tragedy. He's traveling Wednesday to Colorado, the site of a shooting at a crowded movie theater last summer.

The official spoke on a condition of anonymity since the trip had not yet been officially announced.