US presidential contender Mitt Romney is visiting the Middle East, promising closer ties with Israel if elected. US presidential hopeful Mitt Romney has affirmed his backing for Israel during the latest stop on his foreign tour. The Republican candidate is promoting his pro-Israel credentials as he prepares to take on Barack Obama in November's election. During the trip to Jerusalem, a senior aide has revealed that Mr Romney would support an Israeli military strike to prevent Iran from securing a nuclear weapon. The White House candidate has been holding talks with Israeli Prime Minister Benjamin Netanyahu and President Shimon Peres. Mr Romney is also due to meet with Israeli opposition politicians and Palestinian Prime Minister Salam Fayyad, but he will not meet with Palestinian President Mahmoud Abbas. He told Mr Peres: "Like you, we are concerned about the development of nuclear capacity on the part of Iran and feel it would be unacceptable for Iran to become a nuclear-armed nation." His senior national security adviser went further, telling reporters: "If Israel has to take action on its own, in order to stop Iran from developing that capability, the governor would respect that decision." Mr Romney is hoping that a tough stance on Iran will be a vote-winner in the forthcoming election. He has previously accused Mr Obama of undermining Israel and boosting its enemies. Romney: Nuclear Iran Would Be 'Unacceptable'