I believe it was Nunes a few weeks ago who said ambassadors would be looked at:
Paul Sperry
@paulsperry_
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#SpyGate investigation of the investigators is expanding to include the US Embassies in Kiev and London, as the Obama State Department’s role in the scandal mushrooms
12:41 PM - 22 May 2019
https://twitter.com/paulsperry_/status/1131283952315043840
Prize For Most Obtuse Political Statement of 2019 (so far). Pelosi spends morning discussing impeachment and then says she has to "wonder" why Trump "took a pass" on her infrastructure ideas.