Obama will appear in the White House briefing room at 1630 GMT and is likely to bolster US warnings that Iraqi Prime Minister Nuri al-Maliki must drop what Washington sees as a sectarian approach to governing, which has worsened the situation in the country.
Obama's statement comes as he studies options for responding to the swift offensive of the Islamic State of Iraq and the Levant (ISIL) which has grabbed swathes of territory in Iraq and threatens to splinter the country along sectarian lines.
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