A week after reports surfaced that the eavesdropping extended to German Chancellor Angela Merkel's mobile phone, Obama is under pressure to take steps to reassure Americans and allies.

A senior administration official said United States has made some individual changes in eavesdropping practices but as yet had not made across-the-broad policy changes such as ending intelligence collection that might be aimed at allies.

The official said the White House is considering a ban on intelligence collection aimed at allied leaders. A White House review that Obama ordered after NSA documents were made public by former contractor Edward Snowden is expected to be completed by year's end.

Obama has come under fierce criticism abroad over allegations the NSA tapped Merkel's mobile phone and conducted widespread electronic snooping in France, Italy, Spain and elsewhere.

At least some of the spying appeared to have been done without Obama's knowledge.

US Senator Dianne Feinstein, the California Democrat who leads the Senate Intelligence Committee, said on Monday that her committee will conduct a major review of all intelligence collection programs.


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