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笔谤别蝉颈诲别苍迟听Barack Obama聽will announce on Wednesday that Vice 笔谤别蝉颈诲别苍迟听Joe聽Biden聽will lead an effort to come up with policies to address gun violence amid calls for action following the massacre of 26 people including 20 children in a Connecticut聽elementary school last week.

The president is not expected to announce policy decisions but rather lay out the process by which his administration will move forward,聽White House聽aides said.

Obama has turned to聽Biden聽in the past to take a role in high-profile policy initiatives, such as efforts to seek a deficit-reduction compromise with congressional Republicans in 2011.

Biden's mission聽- to coordinate a process among government agencies to formulate policies in the wake of the聽Newtown聽shootings - comes just days after an event that appears to have generated a national outcry for greater efforts to stem gun violence.

The聽Connecticut聽massacre was the fourth shooting rampage to claim multiple lives in theUnited States聽this year.

The president issued a call to action at a memorial service in聽Newtown聽on Sunday, demanding changes to the way the United States deals with gun violence. Obama said that in coming weeks he would "use whatever power this office" holds to start efforts to preventing further such tragedies.

However, gun control has been a low priority for most U.S. politicians due to the widespread popularity of guns in聽America聽and the clout of the聽National Rifle Association, the powerful gun industry lobby.

The constitutional right to bear arms is seen by many Americans as set in stone, and even after mass shootings, politicians have tiptoed around specific steps to limit access to lethal weapons.

Even so, the horror of the聽Newtown聽killings, in which a 20-year-old man killed 6- and 7-year-old children and their teachers in their classrooms before taking his own life, has provoked an apparent change of heart in some politicians who have previously opposed gun control.

One such lawmaker is Democratic Senator聽Joe Manchin听辞蹿 West Virginia. The gun rights advocate said he would now be open to more regulation of military-style rifles like the one used in聽Newtown. Obama spoke with him on Tuesday, the聽White House聽said.

The聽White House聽spelled out some gun control measures on Tuesday that Obama would support.

White House聽spokesman聽Jay Carney聽said Obama would back U.S. Senator聽Dianne Feinstein's effort to reinstate an assault weapons ban. The president also would favor any law to close a loophole related to gun-show sales, he said.

Efforts to limit high-capacity gun ammunition clips would be another area of interest, Carney said.