Former US ambassador to the UN Jon Bolton on Sunday night announced that he is considering a bid for US president in 2012.

Speaking on Aaron Klein's WABC Radio show, Bolton said he was "very concerned about the direction of national security policy."

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When asked what factors he would consider in making his final decision, Bolton replied: "I think it's very important on the Republican side that we have a candidate against president Obama who can address these national security issues and to be able to debate him as an equal when you get into the 2012 campaign."