Multiple sources: Newt will announce this week; ABC says he will "tout" his time as Speaker

ABC was the first, then National Journal confirmed the news: Gingrich will announce this week that he will open an exploratory committee.

ABC:

His advisors say a Gingrich campaign would tout his accomplishments as Speaker of the House from 1995 to 1999 -- most importantly under his speakership the budget wasn't just balanced but generated more than $400 billion in surpluses. Advisors say this sets him apart from the field. He won't just talk about the federal debt, but can take credit as the only candidate with a record of dealing with it effectively. He also oversaw comprehensive welfare reform, tax cuts and a reduction in the growth of government spending.