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Mr O'Brien, a foreign office minister, said there were a number of areas where Mr Blair had been able to influence the US position.
"Certainly everyone would accept we have had some influence in encouraging President Bush to become the first US president to call for a Palestinian state independent of Israel and to support the whole road map process," he told BBC Radio 4's Today programme.
"Certainly Tony Blair has encouraged President Bush to move down that road. Indeed ... President Bush said he supported a two state solution and that's our policy too"
But Mr O'Brien said he could not comment on whether Mr Bush had consulted Mr Blair before giving his support to Israel's plan to leave Gaza and parts of the West Bank.
We the undersigned former British ambassadors, high commissioners, governors and senior international officials, including some who have long experience of the Middle East and others whose experience is elsewhere, have watched with deepening concern the policies which you have followed on the Arab-Israel problem and Iraq, in close co-operation with the United States.