The President meets with British Prime Minister David Cameron before addressing Parliament on Wednesday.
Israel's Prime Minister drew a standing ovation from Democrats and Republicans.
President Obama's likely to do the same on Wednesday in London.
At a news conference Wednesday, President Obama talked about the U.S. and the U.K. working together to keep the pressure on Moammar Khaddafy in Libya.
"Time is working against Khaddafy and he must step down from power and leave Libya to the Libyan people," President Obama said.
In a major speech before Parliament Wednesday, the White House says President Obama will likely get a warm reception, as did Israel's Prime Minster when he addressed Congress Tuesday.
"It's time for President Abbas to stand before his people and say 'I will accept a Jewish state,'" said Benjamin Netanyahu, Israeli Prime Minister.
His line in the sand includes no pre-war borders, as President Obama suggested, Palestinians breaking all ties with Hamas, and not allowing refugees to re-claim the homes they left.
"We're not going to accept the great-grandchildren of Palestinian refugees. It's crazy. Everybody knows it," said Netanyahu.
Back in London, President Obama met with British Prime Minister David Cameron, served barbeque to British and U.S. veterans and hosts his own lavish dinner for the Queen Wednesday night before heading to the G8 summit in France.