On 'This Week': Vicki Kennedy, Jack Lew and Rep. Paul Ryan

NEW YORK, June 28, 2012— -- Vicki Kennedy, the widow of the late Sen. Ted Kennedy, a driving force behind the push for health care reform, speaks exclusively with George Stephanopoulos Sunday on "This Week."

In her first interview following the Supreme Court's landmark ruling upholding the Affordable Care Act, Vicki Kennedy weighs in on what the court's historic decision means for the country, and for her late husband's legacy on health care reform, which he championed for over four decades in the Senate before his death in 2009.

Plus, White House chief of staff Jack Lew and House Budget Committee chair Paul Ryan, R-Wis., react to the Supreme Court's blockbuster decision to uphold President Obama's signature piece of legislation, and discuss what happens next in the battle over health care reform.

With Chief Justice John Roberts writing the 5-4 majority decision declaring constitutional the individual mandate requiring Americans to buy health insurance or pay a penalty, the White House gains a major win less than five months before the presidential election. Will validation by the conservative chief justice provide a seal of approval for health care, and draw more public support for the still-controversial legislation? Or will Republican calls to repeal "Obamacare" grow stronger through the remainder of the 2012 campaign?

White House chief of staff Jack Lew and Rep. Paul Ryan discuss the landmark health care ruling, Sunday on "This Week."

Then, the "This Week" powerhouse roundtable debates the Supreme Court's key health care and immigration decisions and all the week's politics, with Keith Olbermann, ABC News' George Will, Democratic strategist and ABC News contributor Donna Brazile, former Rep. Artur Davis, and "Nightline" co-anchor Terry Moran, who covers the Supreme Court for ABC News.

As the Obama and Romney campaigns continue sparring over jobs and the economy, how much will the Supreme Court's decision impact the race for the White House? Will growing fears of over-politicization of the Court change following the health care decision, or does Justice Antonin Scalia's vocal dissent on Arizona's immigration case earlier this week signal continuing partisan rancor? And what will this week's decisions mean for the legacy of Chief Justice Roberts and the current Supreme Court?

Plus, "This Week" takes its weekly trip down memory lane in "What Year Was It?" See the whole political picture, Sunday on "This Week."