Washington (CNN) - The U.S. Senate will begin voting on amendments to gun legislation on Wednesday, including the leading proposals for tighter restrictions spurred by the Connecticut school massacre in December.
Senate Majority Leader Harry Reid said the list of first votes would include the bipartisan yet controversial agreement on expanding background checks proposed by Sen. Joe Manchin, D-West Virginia, and Sen. Pat Toomey, R-Pennsylvania.
Also up in the first round will be Sen. Dianne Feinstein's proposed to ban the sale of semiautomatic firearms modeled after military style assault weapons.
President Barack Obama and many Democrats support a renewed assault weapons ban and an expansion of background checks as well as other measures before the Democratic-led Senate.
A proposal by Republican Sen. John Cornyn of Texas on a proposal to make
state concealed weapons permits acceptable throughout the country will also be considered.
Other votes include a bipartisan amendment dealing with mental health and five other measures.
Each amendment needs 60 votes to pass and the first votes will start in the late afternoon.
Debate on the Senate gun bill is expected to last at least two weeks.
The drive for tougher gun control was spurred by the massacre of school children and educators by a lone gunman in the quiet community of Newtown, Connecticut, just before Christmas.
Polls since show a preference among Americans for some type of initiative to stem gun violence.
Obama and others also have been highlighting daily gun violence in America in their appeal to lawmakers for stricter limits.
Many in Washington have coalesced around expanding background checks conducted on gun sales by the FBI. But settling on the exact wording of such a step has been difficult in a sharply divided political climate.
While Democratic leaders are expressing optimism they'll get enough votes to pass the Manchin-Toomey amendment, a CNN tally of senators indicates the measure is probably in trouble unless several undecided Democrats and Republicans – mostly from conservative states – throw their support behind it.
The proposal would extend background checks to include gun shows and Internet sales.
Reid said last month that Feinstein's proposal, which was approved by the Senate Judiciary Committee on a Democratic party-line vote, has no chance of passage. Yet, he wanted to ensure it received a vote as an amendment rather than join it to a package of measures approved by the panel that would toughen laws on gun trafficking and straw purchases.
The powerful National Rifle Association, the leading advocate on gun rights, fiercely opposes the Feinstein proposal as well as the Manchin-Toomey compromise. It supports the measure on concealed permits.
Speaker John Boehner has said the House would look at anything passed by the Senate, but is not committing to any plan or votes.