As calls mounted in Germany for reprisals by Chancellor Angela Merkel in the latest espionage drama to rattle the allies, the White House would not say how it would follow through on its promise to fix the spat.
"We are committed to resolving the situation appropriately," White House spokesman Josh Earnest said, again paying tribute to the productive and vital alliance between Washington and Berlin.
"There have been some communications in both law enforcement and diplomatic channels to begin to resolve this issue," he said.
German politicians, including Merkel, reacted angrily to reports that a 31-year-old German man arrested last week by intelligence operatives had passed information to the CIA about a German parliamentary probe into disclosures by fugitive leaker Edward Snowden.
Reports based on Snowden's claims that the National Security Agency (NSA) tapped Merkel's phone severely disrupted US-German relations last year.