Coming Up on 'This Week': Treasury Secretary Timothy Geithner

WASHINGTON, July 22, 2011— -- As the Aug. 2 deadline moves closer, another week of budget negotiations collapse with no bipartisan deal on raising the debt ceiling. Can the White House and Congress finally reach an agreement that all sides can stomach? Sunday, on "This Week," Christiane Amanpour speaks with Treasury Secretary Timothy Geithner for the latest on the status of the ongoing talks.

Then, has bipartisanship gone out the window? Former Senate leaders Trent Lott, R-Miss., and Tom Daschle, D-S.D., come to This Week to reflect on tough lessons from working across party lines when they led the Senate, and what Congress and the White House can do to work together better.

Plus, as same-sex marriage officially comes to New York beginning on Sunday, Christiane sits down with New York City Mayor Michael Bloomberg. What does approval of same-sex marriage in the third-largest state mean for gay marriage across the country? Bloomberg is joined by City Hall aides Jonathan Mintz and John Feinblatt, whose marriage ceremony he will officiate this Sunday.

The billionaire mayor and CEO also weighs in on the debt ceiling debate and whether taxes should increase for the wealthy, and if he believes News Corp. CEO Rupert Murdoch should take greater responsibility in the ongoing media scandal.

Plus, the "This Week" roundtable debates the continued divide on the budget negotiations and all the week's politics, including whether Rep. Michele Bachmann's migraine headaches should be a campaign issue. Christiane is joined by ABC News' George Will, Arianna Huffington of the Huffington Post, Fox Business Network senior correspondent Charlie Gasparino, and economist Alice Rivlin, former member of the National Commission on Fiscal Responsibility and Reform.

Finally, ABC News is on the ground from the site of the devastating drought and famine in the Horn of Africa. As the U.N. reports fears that thousands have already died from starvation, is the international community doing enough to aid Somali refugees fleeing to Kenya in hopes of survival? ABC News correspondent Lama Hasan brings her latest reporting to "This Week."