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Sen. Rand Paul, R-Ky., goes one-on-one with ABC News Chief Global Affairs Correspondent Martha Raddatz about President Obama's national security speech, the IRS investigation and more, Sunday on "This Week."

In the first major foreign policy speech of his second term, President Obama defended his administration's efforts to pursue terrorists overseas, while outlining his strategy for a "new phase" in the fight against terrorism. Did President Obama's plans to limit the use of drone strikes go far enough for his critics? How will Congress respond to his renewed calls to close the detainee prison at Guantanamo Bay? Sen. Rand Paul responds, Sunday on "This Week."

And in a "This Week" exclusive, retired Gen. John Allen, former commander of international forces in Afghanistan, speaks out for the first time since being cleared in the Petraeus investigation. On this Memorial Day weekend, Allen discusses the fallout from the Petraeus scandal, as well as the deteriorating situation in Iraq, the ongoing fight in Afghanistan, and the battle against sexual assault in the military.

Plus, two powerhouse roundtables tackle all the week's politics, from the national security debate to continued fallout over the IRS scandal to progress on immigration reform. Rep. Peter King, R-N.Y.; DNC Chair Rep. Debbie Wasserman Schultz, D-Fla.; former Director of National Intelligence Ret. Admiral Dennis Blair; New York Times national security correspondent Mark Mazzetti; ABC News Senior National Correspondent and Fusion White House Correspondent Jim Avila and Politico senior political reporter Maggie Haberman debate those topics and more, Sunday on "This Week."

And in this week's "Sunday Spotlight," the creators and executive producers of Showtime's "Homeland" Alex Gansa and Howard Gordon discuss their hit show.

See the whole political picture, Sunday on "This Week."

** NOTE: Due to the Indy 500 on Sunday, "This Week" will shift the time it airs in several markets. Please check your local ABC listings for more details.**