US President Barack Obama's administration is coping with underwhelming performance on various fronts according to officials cited in the New York Times on Friday, who suggested he may replace some senior administration officials - including US Secretary of State John Kerry. "There is an inflection point in every presidency, and this certainly is a logical one, if the president feels he might be better served by some replacements on his team, Senator Richard Blumenthal (D-CT), a member of the Senate Armed Services Committee, told the paper.