(CNN) -

Germany's government has asked America's top spy chief stationed in the country to leave.

It's a punitive gesture usually reserved for adversarial nations in times of crisis and only very rarely for an ally, particularly a very close one.

But allegations of American spying have seriously injured German trust, Chancellor Angela Merkel has said. And it's time for a reset.

Germany let loose the diplomatic slap, reminiscent of a Cold War rebuke, after news of two new possible U.S. espionage cases broke back to back in a week's time.

Two Germans -- one working at a German intelligence agency, the other in the Ministry of Defense -- are suspected of spying for the United States.

Local media report that both cases involve stolen official German documents.

The U.S. official shown the door is based in Berlin at the U.S. Embassy, which followed up on Friday's announcement with a note to journalists:

"The U.S. Embassy has seen the reports that Germany has asked the U.S. Mission Germany's intelligence chief to leave the country. As a standard practice, we will not comment on intelligence matters."

A German official confirmed that person was the CIA's station chief and that the agency's director, John Brennan, has talked multiple times with his German counterpart.

'So much stupidity'

Top German government officials have candidly spoken about the decision to expel the U.S. official as they poured their disappointment over alleged U.S. spying into microphones and cameras for days.

Most pointedly, Finance Minister Wolfgang Schaeuble casually described the alleged U.S. actions as "daft" before a television talk show audience. "One can only cry over so much stupidity," he said.

He based his remarks on the essential value of Germany's cooperation with U.S. intelligence agencies to fight international terrorism and complained that spying spoils the relationship.

Legal action

The latest allegations weigh densely on ties already burdened since Edward Snowden leaked indications that the National Security Agency tapped into Merkel's own cell phone.

They have seemingly undone any of Washington's diplomatic smoothing over previously alleged NSA intrusions.

One of the new cases has landed on top of an existing investigation on federal prosecutors' desks into the possible spying on Merkel.

The NSA scandal has also prompted prosecutors to set up a new special committee to investigate and criminally prosecute cyberspying by foreign intelligence.

Merkel deferred to the pending results of those investigations, but it didn't stop her from expressing on Thursday the disappointment she feels over the suspected acts.

"From a common sense standpoint, in my opinion, spying on allies is, in the end, a waste of energy. We have so many problems, and we should, I find, concentrate on the essentials."