Coming Up on 'This Week': Presidents Clinton and Bush

— -- Coming up…President Clinton and President Bush on the relief effort in Haiti

President Bush and President Clinton have joined together in an urgent call for immediate assistance for the Haitian people. After their Saturday meeting with President Obama they'll sit down with ABC's Jake Tapper to discuss what the needs are in the short term and the long term. Then as international aid and support pours into Haiti, we'll talk to the two US officials in charge of the relief effort on the ground. Is help getting there soon enough? Can the country be secured? And what should the US commitment to Haiti be going forward? We'll be joined by Lt. General P.K. "Ken" Keen, in Haiti, and USAID Director Rajiv Shah, who leads the government wide response.

And with President Obama headed to Massachusetts to try and save Democrats' 60th Senate seat, is his health care agenda in peril? We'll have exclusive details of a new ABC News Poll that will reveal just how bruising a year it has been for the President. Senior White House Correspondent Jake Tapper takes up those issues and all the week's politics with our roundtable: George Will, Tucker Carlson of the Daily Caller, Democratic Strategist Donna Brazille and Katrina vanden Heuvel of the Nation.

You won't want to miss it.