A key adviser has said that US Republican presidential candidate Mitt Romney would back Israeli military strike against Iran nuclear programme, according to the Associated Press.
The visit is the latest part of a three-nation trip that includes Britain and Poland.
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The announcement by Barack Obama that he will nominate a successor to Justice Antonin Scalia has set up a battle with Republicans.
Anticipation is building ahead of this year's Bafta awards ceremony which is being held at London's Royal Opera House.
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