Washington (CNN) Secretary of State Mike Pompeo on Friday publicly committed to look into the possible surveillance of former US Ambassador to Ukraine Marie Yovanovitch -- more than 48 hours after the evidence of potential monitoring emerged and more than 24 hours after Ukraine announced its own investigation into the matter.

"We will do everything we need to do to evaluate whether there was something that took place there," Pompeo told conservative radio host Tony Katz.

"I suspect that much of what's been reported will ultimately prove wrong, but our obligation, my obligation as secretary of state, is to make sure that we evaluate, investigate. Any time there is someone who posits that there may have been a risk to one of our officers, we'll obviously do that," Pompeo said.

Pompeo's comments Friday were the first public acknowledgment of an inquiry into Yovanoviitch's potential monitoring while serving in Kiev, although a senior State Department official told CNN that the investigation was officially launched by State Department's Bureau of Diplomatic Security on Tuesday night.

'I had, to the best of my recollection, had never heard of this at all'

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