The White House and a bipartisan group of senators will launch separate efforts next week to jumpstart negotiations to overhaul immigration, an issue that has languished in Washington for years.

Obama will start his second-term immigration push during a trip to Las Vegas Tuesday. The Senate working group is aiming to outline its proposals around the same time.

The Senate working group, four Democrats and four Republicans known as the "Gang of Eight," includes Arizona Republican Sens. John McCain and Jeff Flake.

McCain and Flake have been in the middle of the immigration reform debate before. In 2005, when Flake was in the U.S. House, he and Rep. Luis Gutierrez, D-Ill., introduced a reform bill that was scuttled.

McCain and the late Sen. Ted Kennedy, D-Mass., introduced a bill in 2007 that died when opponents attacked its "amnesty" provision for illegal immigrants.

Even before the latest plans are formally unveiled, there is emerging consensus between the White House and many key lawmakers on several key components, most notably the need for a pathway to citizenship for the 11 million illegal immigrants already in the United States.

The proposals will mark the start of what's sure to be a contentious and emotional campaign around illegal immigration, border security and jobs.